Dahlias: How to Plant, Grow, and Care for Dahlia Flowers

The EditorsTue, 06/17/2025 - 11:46

Hi Molly, it sounds to us like it's time to get some new plants; dahlias sprout after 2 to 4 weeks and it's been two months since Easter. Best of luck, —The Editors

The EditorsTue, 06/17/2025 - 10:22

Hi Barbara,

You could try soap or Neem oil at this stage; here is https://www.almanac.com/pest/scale">Almanac.com's complete guide to dealing with scale.

—The Editors

The EditorsTue, 08/13/2024 - 10:22

Hi Eva,

There could be a few reasons why your dahlia buds are not opening. The first thing would be to examine your watering practices. Waterlogged roots from excessive water can affect the buds' ability to open. Also, if your dahlia was planted in poorly draining potting mix or a container that holds water it can lead to too much water that will hinder your buds from turning into flowers. A lack of water can also be an issue, as container planted dahlias need consistent watering because the potting mix dries out a lot faster than those planted in the ground.

If your watering schedule is consistent, it could be an underlying pest issue. If the stems and leaves appear normal but buds are not opening, check them for small holes to determine if thrips or earwigs have punctured or chewed them. Buds that have been repeatedly affected by these pests might not open properly.

Another issue could be excess fertilization in the form of too much nitrogen. If the plant is overfertilized, it will grow luscious foliage at the expense of flowers.

Hope this helps!

The EditorsThu, 06/13/2024 - 10:23

Hi, Subia. We are sorry to hear about your dahlias. They can be fickle plants in hot climates, as they prefer warm days and cooler nights. Here are a few things to try to revive your plants: Add organic matter to your containers. Keep watering (do not soak), and try adding some mulch on top to cool them down. Also, if your dahlias are in full sun, move them so that they get some shade. If all else fails, we highly recommend looking into getting a heat-tolerant variety. They may perform better in your climate.

The EditorsWed, 06/12/2024 - 11:42

Hi Dollie,

Dahlias certainly are beautiful. You definitely want to wait until it has finished blooming, but it is best to wait until the first frost has hit or the leaves have turned brown. At that point, you could transplant your tuber to a new container with fresh potting mix and store indoors in a cool, dark room for the winter. But it would probably make more sense to simply remove the tuber from the current container and store it as outlined above for the winter before then putting the tuber in a new container in the spring. That way you don't have to lug the new, larger container (which will be heavier) in this fall and out again next spring.

Good luck!

The EditorsTue, 03/05/2024 - 08:58

Hi Marleene,

It's not hard to see why you fell in love with dahlias!

Gardening is all about trying new things, so if you want to grow dahlias in your garden you should try it. Growing dahlias will be easier if you plant tubers and not start from seed. For the first year, you can start small and plant only a couple tubers to see how it goes.

There are a few things you want to remember: Don't plant your tubers until after all threat of frost has passed. Plant them in an area that gets lots of sunlight (6 to 8 hours). When you do plant, make sure to follow the steps outlined above.

Since your location is in growing zone 6a, you will want to treat your dahlias as an annual, meaning you want to lift them from the garden in the fall and store indoors during the winter months and then plant again in the spring.

And to get an idea of what dahlia varieties grow best in your area, check with your local gardening center or reach out to your local cooperative extension for guidance.

Hope this helps. Good luck!

CarolMon, 06/03/2024 - 17:57

Growing dahlias is so easy and the sprout up pretty quickly. I planted mine well after Easter and several are over 3 feet high and have beautiful blooms. I do try to cut back and leave just one bloom per stem, making the ones you keep larger. Enjoy!

The EditorsThu, 02/08/2024 - 10:03

Hi Mary,

While dahlias are typically grown from tubers, you can certainly grow them from seed. The only thing to know is that if you collect seeds from a dahlia you grew, it will not grow true to what you had in the garden. Only tubers will stay true to type. Growing dahlias from seed is how new varieties have been created.

If growing from seed, you will want to check the last spring frost date for your growing location and plant the seeds indoors 4 to 6 weeks before that date. Once the threat of frost has passed, you can start by slowly introducing them to outdoor conditions (hardening off) before planting in your garden or in a container.

If you live in a colder region (Zone 7 or lower), you should dig up the tubers at the end of the growing season and store them indoors over winter to be replanted the following spring.

As for beachside gardening, it depends on a number of factors. You want to choose plants that thrive in conditions that come with living near the ocean—salt, wind, and sandy soil—as well as ones that are suitable for your growing zone. In terms of what plants do well in your location, it would be best to check with a local gardening center or cooperative extension for guidance.

The EditorsFri, 12/01/2023 - 11:07

Hi Kim,

You typically want to dig up your dahlia tubers after the foliage has died back following a frost and before a hard freeze. With that being said, depending on the severity of the freeze your tubers might be okay. You should dig them up as soon as possible and inspect the tubers. If your tubers froze, they will need to be replaced. If the ground did not yet freeze to the level they were planted there is a chance they will be okay. If the tubers appear okay, store them for the winter in preparation for planting in the spring. There is still the chance the hard freeze killed the tubers, but you will not know until next year's growing season.

The EditorsMon, 10/30/2023 - 09:20

Hi Courtney,

While dahlias are typically grown from tubers, you can certainly be grown from seed. The only thing to know is that if you collected the seeds from a dahlia you grew, it will not grow true to what you had in the garden. Only tubers will stay true to type. Growing dahlias from seed is how new varieties have been created.

With that being said, you will want to check your last spring frost date for your Zone 8 location and plant the seeds indoors 4 to 6 weeks before that date. Once the threat of frost has passed, you can start by hardening them off (slowly introducing them to outdoor conditions) before planting in your garden or in a container.

In the fall, you can collect the tubers from your dahlia plants and store them over winter to be planted the following spring, as the tubers do not do well in cold winter conditions.

The EditorsMon, 09/18/2023 - 09:44

Hi Katherine,

Dahlias can most certainly be grown in Zone 4, but must be treated as an annual as the tubers will not survive your winters. Plant tubers after the threat of frost has passed in the spring and then lift the tubers to store for the winter following the first frost in the fall.

In terms of what dahlias to plant, you should discuss this with your local garden center to see what is available and/or contact your local cooperative extension to learn what varieties of dahlias thrive in your specific area.

Jennifer KeatingThu, 06/01/2023 - 10:16

Thanks for your feedback, Jenny! We recommend referring to the https://www.dahlia-nds.co.uk/about-dahlias/classification/">National Dahlia Society for more information about specific varieties.

The EditorsTue, 09/13/2022 - 14:05

Check your https://planthardiness.ars.usda.gov/">hardiness zone. If you are in 7 or above, you should be alright leaving them in the ground.

The EditorsTue, 08/16/2022 - 17:11

We've only grown dahlias from tubers, is is tradition. However, it is true that that the dahlia flower will produce both seeds and tubers when grown so you could propagate from either. It doesn't matter which type of dahlia because the tubers will always and consistently produce copies of their “mother” dahlia, but the seeds will not. According to the American Dahlia Society, dahlia seeds will produce varieties different from the parent plants, so propagation from seeds is used primarily to develop new cultivars. Think of it as the dahlia "mother" reproducing with any plant "father" whose pollen an insect carried to the mother. Therefore, it's not surprising you had a diverse variety of children, since they had the same mothers but different dads. The seeds you plant will never grow true to type but that's part of the adventure.

The EditorsFri, 07/01/2022 - 11:25

Lucky you. In your moderate climate, it's easy to just let Dahlia tubers stay in the ground year-round. However, dividing your dahlias will result in more flowers. It's best to go by signs that a plant may need dividing:
• A doughnut-type hole in the center of a plant forms as older portions die
• Lots of foliage but not many flowers
• Stunted growth
• Yellowish leaves

JasminThu, 08/25/2022 - 03:19

98j

The EditorsTue, 02/08/2022 - 16:35

Anyone, anyone? We here at the Almanac have not tried planting/forcing dahlias early. However, the American Dahlia Society has! See the web site, https://www.dahlia.org/growing/fundamentals-of-growing-da..., with this specific observation: If you want blooms as early as possible, you can start the tubers indoors (fig 4) in good light about a month before planting time. You will then have a small plant ready at planting time. Dahlias can be planted as late as mid-June in most parts of the country.

There is a contact page under "About" on the home page, in case you have additional questions.

Amy Wed, 06/29/2022 - 18:06

I have! I live in Minnesota and started them in pots in our heated garage in March-April. I didn't know if it would work because they looked like prunes, but almost all of them sprouted. It was very satisfying :) I planted them outside in the ground in early June. Good Luck :)

BrandyWed, 04/26/2023 - 00:06

Well, they are native to Mexico so try looking around those regions to see if they have any ready at that time

The EditorsThu, 09/30/2021 - 10:42

Yes. Dahlias planted indoors the first week of April will be well started by mid-May. While a greenhouse would be ideal, many growers find that a garage or basement works just fine. Place the pots under fluorescent lights about six inches above the tops of the pots.

The EditorsTue, 09/08/2020 - 15:21

Ultimately, this is likely to be disappointing. Dahlias need space and lilac roots reach out about one and a half times the length of the branches---a 10-foot-wide plant can have 15-foot roots. So the dahlias would be choked out. Look around; you seldom see more than grass under lilacs, and this is why.

The EditorsWed, 06/10/2020 - 14:34

Hi, Shannon. This sounds like fusarium wilt, especially since you say the same thing happened last year. Unfortunately you will need to destroy the infected plants and grow new plants in a different area.

The EditorsWed, 06/03/2020 - 09:57

Plants in pots tend to be hotter and dry out faster than those in ground, especially in clay pots. You've had some success, so you are doing some things right, but you might do better with larger pots and maybe more water (or water retaining soil). See the comments below about growing in pots, too.

The EditorsWed, 06/03/2020 - 09:53

Your dahlia should produce tubers from the original one, but to benefit from these new ones, you need to lift (dig up) the whole cluster, then separate them. Only the tubers with "eyes" will produce flowers; the others you can discard. If your plant has never been lifted, you might want to do this now, separate any new ones, and plant those with eyes.

The EditorsFri, 05/29/2020 - 10:17

Yes, dahlias can be grown in containers. Follow the same spacing and depth requirements mentioned above. Ensure your container size–ensure it’s big enough to support the plant at maturity (generally a 12″ by 12″ container will be large enough). Cover the tuber with a few inches of soil and water it in. Be careful about watering until growth starts…but don’t let the potting media dry out. Also make sure your media is well drained so the tubers don’t rot. You’ll also need to fertilize throughout the summer.

The EditorsFri, 04/24/2020 - 12:18

Thank YOU, Michelle! About your dahlias: We here are eternal optimists, so...Check out your tubers. If they are not dried out to a crisp, plant them, following the guidance above, and see what happens. Then consider buying more soon and plant them as "sure things."

The EditorsMon, 01/27/2020 - 15:19

Try planting a few different varieties with differing heights, staggering them in such a way that they still have room for themselves, but give the appearance of a dense hedge of dahlias.

Check out Burpee's selection of dahlias https://www.burpee.com/flowers/dahlias/?prefn1=height&amp...">here—you can sort by height to see which would work best for you!

The EditorsTue, 09/24/2019 - 15:25

Hi Patricia,

If you live in USDA Zone 8 or higher, you can leave the dahlia in the pot or in the ground over the winter. In regions that experience freezing or below freezing temperatures, follow the instructions under Harvest/Storage and Taking Up the Tubers, which can be found above on this page. We hope this helps!

The EditorsMon, 07/29/2019 - 16:33

Dahlia bulbs are planted in the spring once risk of frost has passed. They will grow quickly and the plants will be blooming by mid to late summer.

In your region, dahlias also need to be lifted out of the ground for winter storage if you want them to bloom next year. Many gardeners treat dahlias as annuals.

So, given where you live, you could try storing the tubers over the winter. If properly stored (usually in a vermiculite or peat moss), they should be fine.

The EditorsMon, 07/15/2019 - 12:32

When dahlias bloom has a lot to do with the soil warmth and how deeply they are planted (ensure an eye is present on each tuber clump). We would suggest early blooming variety if possible. We have had late varieties that never bloomed before the first frost in the fall! Also: Once the leaves begin forming and the plants are 3 to 4 inches tall, pinch the terminal bud just above the second pair of leaves. This will produce two main stems. Remove the buds when the flower buds are visible. This will increase the bloom size of the leader bud and improve the flower stem formation. Flower buds come in sets of three. The central leader bud will produce the largest bloom. There will be a smaller flower bud on each side of the leader bud. Remove these side buds by pinching. Further down the same stem, two more buds will be found in the leaf axils and these, too, should be removed.

The EditorsMon, 06/24/2019 - 15:48

Monitor the plants for any beetles, caterpillars, or slugs that could be munching on the foliage. If you don't see any culprits, try using a pesticide like neem oil or an insecticidal soap.

The EditorsMon, 06/24/2019 - 16:41

You can also cut the flowers in the morning and place the stems in a bucket of water outdoors in the shade. The insects should leave without your doing anything else. Before you bring the flowers into the house, inspect them and, if necessary, shake them gently. Remove any bugs by hand or with a small soft paintbrush.

The EditorsWed, 06/06/2018 - 12:02

If you haven't planted the tubers yet, then yes, you should trim the shoots down to 1 inch before planting. It's recommended to pinch back stems only slightly once they have developed 3 to 4 sets of leaves. This will encourage the plant to branch out from the stems, giving you a fuller plant.

The EditorsTue, 04/17/2018 - 13:03

Growing in a pot/container is essentially the same as in the ground. Make sure that the pot is large enough to give the tubers room to spread out, and if staking/support is needed, arrange it in the pot when you plant the tuber (as if you were planting in the ground). Staking later risks injury to the tuber and potentially loss of it or the bloom.

KeithFri, 05/11/2018 - 07:03

Can l over winter dahlias in pots in a garage or greenhouse l live in the uk

Maryann Noah Wed, 05/16/2018 - 20:24

I live inOlive Branch ,Mississippi. ( right by Memphis Tennessee ). Can I grow Dinner plate Dalias in Large pots?( I’ve already planted & they are starting to come up....3 inches tall) my pots sre 24 inched wiwide & 3ft tall.

The EditorsTue, 04/17/2018 - 12:33

It's not entirely clear: If you now have 30 plants in the ground, you can lift the tubers and divide them. This is best done in spring or fall. Use a sharp knife to cut the tubers apart. Note that only those with an eye (a dormant bud) will grow stems, so you can cut large clumps of tubers instead of discarding single ones without eyes. Let the roots dry for a day or so before storing (see above) or planting elsewhere.

The EditorsTue, 04/17/2018 - 12:49

Thank you for pointing out the error in the text. We have corrected it. Here's what we learned: you want to dig a hole that's 6 to 8 inches deep. Set the tubers into it and cover them with 2 to 3 inches of soil (some say 1 inch of soil is ok, too). As the plant grows/sprouts up, fill in with soil around it until the ground is level. BTW, if you plan to stake the dahlia, place the stake in the hole first, then the tuber and cover as described. If you wait to push a stake into the ground, you might strike and damage the tuber. Thanks again!

Irene HubbellSun, 07/07/2019 - 12:46

Can I plant spent blossoms and start new plants.

The EditorsTue, 01/09/2018 - 11:54

The general consensus is not to break off the shoots and plant the dahlia tuber as you would normally. If there is any rot, cut it off, and be aware that if the tubers are dried out, they may not thrive or grow. A reader wrote in to endorse the idea of leaving the tubers as is: "I never break them off [when] they grow new shoots, [and] never have a problem with them growing."

Pat CatuaraMon, 08/06/2018 - 11:45

I have potted plants that look healthy and have buds but do not open.

The EditorsFri, 11/10/2017 - 10:12

If your dahlia tubers fall apart when being lifted out of the ground, then they are rotten and should be disposed of. If it's just the foliage that detaches from the tubers, the tubers themselves are probably just fine; you'll have to dig them up and have a closer look. If they are squishy and fall apart easily, then they are no good. In the fall, especially after a frost, the foliage dies off naturally, which is when it easily detaches from the tuber.

The EditorsFri, 10/13/2017 - 16:51

Some cultivars of dahlias (and other common-grown flowers) are not genetically "stable," meaning the flowers they send up may not always be the same color or shape. Your original purple dahlia was likely a hybrid of several other dahlias, and it just so happens that another color showed up this time.

Flossy Sun, 11/12/2017 - 19:15

I live in England and have experienced this with blue hydrangeas that turned pink. I researched and learnt that at transplanting, the acidity of the soil has a bearing on the flower colour. Solution is to buy erocutious compost. I use this for camelias as well

The EditorsFri, 08/25/2017 - 09:46

There are a couple things that could have resulted in weak dahlias:
1. The tubers themselves could have come from a bad or diseased source.
2. There aren't enough nutrients in the soil. Did you add any fertilizer to the soil before planting? Dahlias are heavy feeders, so having two seasons of dahlias grow in the same spot without any extra fertilizer could have simply depleted the soil's resources. See our advice, above, about fertilizing dahlias.

Greg SureckTue, 08/22/2017 - 17:24

I live in so ind zone 6. first frost may be as late as thanksgiving! or early as mid october. also. I watered my plant heavily the nite before it fell over

The EditorsWed, 08/23/2017 - 17:00

Foliage should be cut back to 2 to 4 inches above ground and lifting and separating should be completed in early fall. Don't bury it if you are going to lift to overwinter it later in season.

Jan DeckardWed, 06/05/2019 - 09:11

what do i do

The EditorsTue, 07/11/2017 - 09:59

Overwatering can cause tubers to rot. After dahlias are established, provide a deep watering 2 to 3 times a week for at least 30 minutes with a sprinkler.

The EditorsThu, 07/06/2017 - 11:28

Oh, those doggies! It depends. If the dahlia broke off at the base of the plant, it's fine for next year. But if the tubers are pulled off or if they break off, the buds are almost always lost and the tubers are worthless.

AmberSat, 07/15/2017 - 14:10

I seriously have the same question. I bought some of the dinner plate dahlias and underestimated how big they'd get and now I seriously need to move them. Is it safe to do so?

VictoriaThu, 10/12/2017 - 19:41

I also underestimated how big they would get. We are zone 4, so they have to be dug up anyhow, so i am going to move them. Under care it tells you how to prune them for moving. Good luck. I have Thomas Edison Dahlias and they are so beautiful. Love them.

The EditorsTue, 06/13/2017 - 12:33

There’s no need to water the soil until the dahlia plants appear; in fact, overwatering can cause tubers to rot. After dahlias are established, provide a deep watering 2 to 3 times a week for at least 30 minutes with a sprinkler.

The EditorsTue, 06/13/2017 - 08:54

Hi Nancy,

Unfortunately, once the tubers have become moldy, there's no way to get rid of it. There are tips for preventing the mold from forming in the first place, but that advice is only helpful for future tubers. Continue with what you are doing however; maybe the tubers will recover. Try planting a couple of them and see what happens. Gardening is an experiment, after all. For future prevention of the white mold, dry out the tubers before storing them: Moisture is the enemy. Store them in a cardboard box filled with peat moss, keeping the temperature between 40 and 50°F. Check the tubers once a month to make sure they are not shriveled. If they are, spray a little water on them, but not too much. We hope this helps!

The EditorsTue, 05/30/2017 - 15:33

Dahlias are native to Mexico and Guatemala, and our sources suggest that dahlias can be grown in hardiness zone 9 (close enough) and blooms from May until October. Plus, they can be treated as perennial hardy bulbs and left in the ground (not lifted). Texas AgriLife and the Cooperative Extension services have more specific information. See here: http://easttexasgardening.tamu.edu/2014/06/26/dahlias/ Happy birthday and good luck!

The EditorsTue, 05/09/2017 - 10:43

The general consensus is not break off the shoots and plant the dahlias as you would normally in the greenhouse. Be aware that if the tubers are dried out, they may not thrive/grow.

AmberFri, 07/14/2017 - 09:25

I never break them off they grow as new shoots, never have problem with them growing!

The EditorsMon, 04/24/2017 - 16:54

You can safely fit one dahlia in a six-inch pot, and in bigger pots, you may be able to fit two. Give the dahlias enough space to stretch their roots and be sure to use well-draining soil. Otherwise, they may become waterlogged and could rot.

The EditorsWed, 03/22/2017 - 11:30

Hi, Karen, We are going to recommend that you contact the Snohomish County Dahlia Society not far from where you are. They have lots of information, and shows, and gardens, in addition to specific advice on dividing dahlias here: http://www.scdahlias.org/howto/index.cgi?howto=digdivide

This could be the beginning of a beautiful relationship!

AmberFri, 07/14/2017 - 09:31

you can divide them they are like potatoes look for the eyes and split between them , then you can grow more.

The EditorsTue, 02/21/2017 - 16:03

These do best where there is at least 8 hours of direct sun. However, if you have concerns, check the packaging or even the source from which you go the bulbs, Cyndi.

The EditorsTue, 12/13/2016 - 14:25

As long as you stop watering them for the winter, they shouldn't rot. Dahlias grow as a perennial in your zone, which means they don't need to be dug up. Once the first hard frost hits, cut back the foliage to 2 to 4 inches above soil level. Then, cover the plants with 3 to 4 inches of mulch--bark chips, pine needles, straw, or compost will work.

The EditorsTue, 11/22/2016 - 10:29

Hi, Lora, We tend to error on the side of being safe, rather than sorry, so would recommend you lift the dahlias now. You can/should replant them between mid-March and May, as your time allows. We're a little puzzled about soil on one side of the fence freezing and not on the other side; can't explain it except to think that perhaps the unfrozen side is the south side and gets all the sunshine and the other side is blocked. Still, you can't fool Mother Nature—or fence her in, so lift for the life of your dahlias.

The EditorsThu, 11/10/2016 - 14:54

Sorry, Erica, You are not in Zone 8. See here where you are (and where 8 is): http://www.almanac.com/content/plant-hardiness-zones

The EditorsWed, 10/12/2016 - 13:02

Experimenting can be fun, but we suggest doing so with just a few of your tubers, the rest should be taken out of the soil. You want them to be cool and dry. The soil will have moisture in it, which could cause the dahlias to rot.

The EditorsFri, 10/07/2016 - 14:28

Dahlias are tubers. They should be planted in the early spring after the threat of frost has passed. In cold climates, they should be dug up in the fall and stored in a cool dry place like a garage. They can't withstand freezing temperatures. In warm climates, they can stay in the ground year-round.

The EditorsWed, 10/05/2016 - 10:21

Actually it sounds like you have the ideal conditions for growing container dahlias. They should do quite well.

The EditorsWed, 08/17/2016 - 11:56

Hi, Tim, Most of the information you need is above—but before you look there, look here for your growing zone: http://www.almanac.com/content/plant-hardiness-zones Click on the map and figure out which zone you are in. Then look above: See the two bullet points in the "Care" section. If you are in or very near to zone 8, for example, you may not need to do anything to your dahlias. Then look at the next section, "Harvest/Storage Taking Up the Tubers." (Taking up is also called "lifting," by the way.) All the steps are there. You should be good to go!

Thanks for your interest in The Old Farmer's Almanac!

The EditorsFri, 07/29/2016 - 14:25

Hi Lynda,

Wait until they have finished flowering to move them. In the meantime, you can do some staking to keep them from flopping over. Use garden stakes and a light twine. Try making a "star" by placing 3 to 5 stakes around the plant, tying twine to one stake and weaving in and out of the plant from stake to stake (wrapping twice around each one) in a star-like pattern. Also, be sure to dead head spent blooms to take some of the weight off.

The EditorsWed, 06/29/2016 - 16:33

It is hard to say for sure, but it could be water related. Dahlias do best with a good weekly soaking. Light surface applications are not sufficient.

The EditorsWed, 06/29/2016 - 16:30

The "eyes" or growth buds on dahlia tubers occur only in the area that connects with the underground stem. If the tubers break off, the buds are almost always lost and the tubers are worthless, which would explain why they aren't growing.

The EditorsFri, 06/24/2016 - 14:56

The white substance is probably powdery mildew, a fungus. Though difficult to treat, it will not harm the plant. Get rid of as much contaminated foliage as you can, including anything on the soil surface. Let your plant dry out before giving it a deep watering, then let it dry out again before another deep watering...and so on. Avoid getting the foliage wet--powdery mildew thrives under moist conditions.

The EditorsMon, 06/06/2016 - 14:38

You likely got them in the ground in time. They may bloom later than usual, but that doesn't seem like a bad thing now does it?

The EditorsWed, 05/25/2016 - 15:02

Plant the tubers with the growing points, or “eyes,” facing up, about 6 to 8 inches deep. The crown should be just above soil level. See more planting advice at the top of this page.

The EditorsMon, 05/09/2016 - 16:40

It's better to divide the roots in the fall after your first frost. Carefully lift the plants and replant them in a bigger pot or in the garden. Add some compost or aged manure to the soil before planting. In the fall dig the dahlias and divive the roots.

KempnySat, 05/07/2016 - 17:41

Search in google for: USDA Plant Hardiness Zone Map Click the first link. Then type in your zip code and it'll tell you. (i tried pasting the link but this site wont let me) Cheers

William GoeschSat, 06/03/2017 - 16:34

I bought some tubers that have about 3 inches of shoot.Can i break them off without hurting plant ob try to plant them the way they are

The EditorsMon, 04/25/2016 - 16:59

If we understnad what you mean by pinching, we would be disinclined to do that, as that might mean pinching or cutting off or dead-heading the new flowers.

What you need to do is divide your tubers every three years. Or, in this case, maybe as soon as possible. This will force larger, sturdier plants, thus avoiding flopping specimens. Dividing is best done in spring.

The EditorsThu, 04/21/2016 - 16:38

It's a good idea to start the dahlias in pots. This way you can move the pots into the sun and into a sheltered spot if the weather turns cold or nasty. Plant the tubers in deep pots with some good potting soil and keep the soil moist.

The EditorsMon, 04/18/2016 - 20:49

Hi Carol, You live in Zone 6a: -10F to -5F. See the Plant Hardiness Zone Map here: https://www.almanac.com/content/plant-hardiness-zones">https://www.almanac.com/content/plant-hardiness-zones

You will need to lift your dahlia tubers to overwinter them.

The EditorsThu, 04/14/2016 - 15:50

Hi Alice,

It depends on where you live in Tennessee. Dahlias are hardy in USDA zones 8 to 10. In zone 7, they can survive winters with a thick layer of protective mulch.

The EditorsTue, 04/05/2016 - 10:27

Dahlias vary widely in size so there is no standard guideline for spacing. One clump per pot may be best.

The EditorsThu, 03/31/2016 - 10:38

Don't worry about how you planted the tubers in the pots, the shoots will find their way to the surface. Some tubers don't have eyes (small, raised white, yellow, and sometimes pinkish pimples) and are called blind tubers. These will not grow into a plant.

The EditorsTue, 03/01/2016 - 11:55

You can start dahlias in containers indoors. Make sure to use clean pots with draining holes. Fill the pots 1/3 full with a light potting mix, do not use garden soil. Water and then lay the dahlia tubers horizontally on top of the soil. Cover lightly with potting mix. Keep the soil moist but not wet. As the dahlias start to grow fill in with more soil around the new green stems.

InezSun, 02/14/2016 - 11:16

Hi! I just read your comment and am very interested in your storage technique. My Mom used to have dahlias every year and this is the first year that I have tried to overwinter mine. My Mom used to water the bulbs early in the spring to encourage them to bud. Do you do this? If so, when do you do it? My Mom used to keep the roots in cellar where it was dry and dark and they were absolutely fantastic every year (although a fair amount of work also)! Thanks for your input. Wish me luck....

The EditorsMon, 11/09/2015 - 12:35

We are not sure what the "centipede" bug is. Next year plant the dahlias in a new location or plant them in containers. For the leaf hoppers use a forceful spray with water or soapy water (mix 1 tbsp. liquid soap with 1 quart of water) up to 4 times a week.

Justin SmithFri, 03/04/2016 - 11:30

Pill bugs resemble centipedes and eat roots.

Rusty BrownSat, 04/09/2016 - 09:19

By "liquid soap" do you mean dish or liquid laundry detergent? These are not really "soap". Chemically they are quite different from "soap" but people often use the term "soap" when referring to them. Or do you mean some kind of genuine liquid soap?

The EditorsSun, 04/10/2016 - 06:51

By liquid soap, we prefer a castile liquid soap, one that does not contain additives such as fragrances, moisturizers, or additional chemicals)

The EditorsWed, 09/16/2015 - 09:43

When frost threatens you can bring them indoors to enjoy for a little longer. They may blossom for a while but dry house conditions and low light are not conducive to blooming and they will start to die down. When that happens cut off the tops, stop watering, and pull them out of the pot to dry. Store for the winter in a cool, dark place.

The EditorsTue, 09/15/2015 - 15:07

It's better to leave them in the ground as long as possible. We suggest that you wait for the first fall frost and then dig them up and discard the brown stalks.

The EditorsMon, 09/14/2015 - 11:05

Hi Steve,

Leave the dahlias in the garden until the tops have turned brown from the first fall frost. Then dig the tubers and remove the frostbitten tops before storing.

The EditorsMon, 08/31/2015 - 12:01

Hi Jen,

Cut the dried stems and leaves off the plant and dig up the tuber. If the tuber looks OK and not dried up you can replant it and it will grow new leaves after a resting period. Make sure to water it frequently if the weather stays dry.

The EditorsThu, 08/13/2015 - 10:00

Dahlias need a lot of light to grow and bloom, so planting in house over the winter is not really an option. Store the bulbs in paper bags in a cool (but not freezing) dark place. It's very possible that they will dry out and be of no value, but what have you got to lose?

We've all done this at one time or another. . . Next season, buy at full price, plant both the new and old tubers and see what happens. That way, you won't be waiting another whole season for their beautiful display.

Jose RamirezTue, 09/01/2015 - 21:19

Yes, it is too late to plant dahlias in Phoenix. Tuberous Dahlias and Begonias are to be planted in Early Feburary, to be Viable.

The EditorsWed, 07/01/2015 - 13:34

The tubers may rot if the plants have been overwatered. It is suggested that you water dahlias deeply 2 to 3 times a week. You can gently dig up a tuber and see if it is rotten or if it has any new growth showing. Water only when the soil is very dry and see if you can get some new growth started.

The EditorsTue, 06/23/2015 - 01:53

There will still be regrowth from the dahlia tubers and roots left behind. With the broken stalks, you could try to take a cutting of one of the growth tip branches, dip the end in a rooting hormone and plant in soil.

As you may know, dahlias do not have a long tap root and will get blown over in the wind. Staking dahlias is essential. Stake next to the tuber hole when you plant so that you don't later ruin the tuber. Stakes should be 4 to 5 feet tall. If the stalk breaks, it can not be replanted.

Ashley DresenTue, 06/23/2015 - 08:17

Thanks for your help. I have learned my lesson and from now on will stake them!

The EditorsThu, 06/18/2015 - 17:03

Hi Jennifer,

Dahlias usually take about 8 weeks from planting to bloom. Your dahlias will start growing faster as soon as they break ground. When you see the new growth you can start watering a bit more.

Barbara SullivanFri, 07/24/2015 - 14:20

I had planted some dahlias last summer that were so beautiful so I dug up the tubes and stored them in a bag of moss. Well I accidentally thew them out and I must not have dug up all the tubes cause I now have a great big dahlia growing there now, it has"nt bloomed yet but its getting ready! I am shocked given the harsh winter we had here in northwest Ohio.I have my dahlias next to my hibiscus and the old stems from them help support my Dahlia. I also have them planted where there was an old tree trunk that I have dug out and the wood from the roots and tree make the soil a perfect spot for any plant, that spot will grow anything. It is very light and airy. Good luck on your Dahlia.

The EditorsFri, 05/29/2015 - 01:49

Send your picture to us here: AlmanacEditors@yankeepub.com We don't have a research service but we'll take a look!

The EditorsFri, 05/29/2015 - 01:23

We've never grown dahlias indoors because they need a lot of sunlight to bloom.

The normal thing is to allow them to die back naturally (do not cut them down!), remove the foliage, and let them dry in the sun for a day. Then brush off the dry soil and store them for the winter.

Plant or pot the following March after dividing the tubers so that each one has an "eye" or bud.

The EditorsMon, 05/18/2015 - 11:18

Hi Emiloo,

You can keep the dahlia in a container if you like. Dahlias need lots of sun so place it in the sunniest spot you have. Please see our planting and care advice above for best results.

The EditorsMon, 05/18/2015 - 11:14

If the dahlia tuber is big enough it will send up new sprouts.

Mahendra DevWed, 04/29/2015 - 20:52

mahendra dev Durham NC usa in my enthusiasm after my return from a visit to india I went to garden center and purchased 7 packs of different dahlia and planted them in ground in first week of April and covered them with soil . I have planted dahlias in past and they are flourishing. April gets lot of rain and temp stays in 60 -70 during day 40 50 at night. None of the new one have sprouted whereas old plants have come up with leaves. WILL TUBERS will rot or come to life when in may temp rises to 75-82? I should have known better but mistake do occur please advise

The EditorsMon, 05/04/2015 - 12:11

It is better to wait and divide the dahlias in the fall. You can divide the tubers in the early spring before they start growing. It's important to let the cut surfaces dry out before planting back into the soil.

The EditorsTue, 04/21/2015 - 16:39

Hi Barry,

It sounds like your tubers dried up over the winter. It's best to dig the dahlias in the fall after the leaves have turn black from frost. The tubers will then have had time to prepare for winter and will less likely dry out. The temperature for winter storage should be 40 to 45 degrees. If it is warmer the tubers will dry. You can plant the tubers and maybe you'll get one of them to grow.

Melissa RobertsSun, 05/10/2015 - 12:37

I'm curious how did your plant turn out? Im also from PA,so I'm happy to hear that you were able to plant them the year before. This is my first year for planting just bulb plants. so we'll see how I do.

The EditorsTue, 04/07/2015 - 17:22

Hi Marje,

The tubers may still sprout new growth. Plant them in soil in a warm spot (in a pot or in the ground) and water only if the soil is dry.

The EditorsMon, 03/30/2015 - 17:08

Hi Krystina,

Plant the dahlia in a bigger pot with new fresh well-draining soil. Only water if the soil is bone dry. Place it in full sun.

The EditorsMon, 03/30/2015 - 17:05

Plant the tubers in the pots without cutting the stems. When the dahlias start growing and show some leaves you can decide if you want to prune the stem.

The EditorsWed, 03/25/2015 - 14:52

Your winters are too cold for dahlia tubers in the ground. Dig them up in late fall after the tops have turned brown from your first frost.

Kyra2007Mon, 03/23/2015 - 15:12

Plant your bulbs in a flower pot make sure the stolk is up and bulbs are down. I'm growing mine in side now as well , put the pot next to a window with full light Transplant when no frost will be present

The EditorsMon, 03/09/2015 - 14:50

Hi Debra,

Yes, you can start dahlias in containers. If you plant them in big containers you don't have to transplant them into the ground. See more helpful tips at www.dahlia.org/index.php?page=growing-dahlias-in-pots

The EditorsMon, 03/09/2015 - 14:53

Dahlias are easy to start from seed and they should germinate in 5 to 7 days. Use a good light potting mix and move the seedlings into bigger pots as they grow. Dahlias started from seed will bloom this summer but the plants may be smaller than dahlias planted from tubers.

Leslie Ann BowersWed, 01/28/2015 - 13:34

Oh...I'm in southern Texas, zone 8/9.

The EditorsFri, 01/30/2015 - 15:04

Hi Leslie,

Yes, cut any old stems back to 6 to 8 inches tall.

The EditorsMon, 12/22/2014 - 10:29

Hi Shirley, You can leave the dahlias in the pot if you keep them in a cool dark garage. Cut off any brown stems and leaves. Only water occasionally during the winter months. Or, you can dig them up and dry the tubers before storing. See our storing advice on this page.

The EditorsMon, 11/24/2014 - 14:31

Hi Ryane,

Start the dahlias as soon as possible in the spring, after your last spring frost. The longer the growing season the bushier the plants will get and the more flowers you will have. Remember to start cutting flowers to produce more buds and flowers. Good luck!!

Beth GraggWed, 07/29/2015 - 08:32

Thank you! This answered my question exactly -- I have a wedding in August, and my dinner plate dahlias are already blooming in mid-July (beautifully!) and I want to make sure I have some for late August. I will cut them now and hope they produce more!

The EditorsMon, 11/17/2014 - 10:30

The stems should be cut back to a height of about 6″ before storing the tubers. The one tuber with no stem should be OK. You can divide the tubers next spring before planting. Even the smaller tubers will grow into beautiful plants.

The EditorsTue, 11/11/2014 - 10:32

Hi Katy,

It is too cold to leave the tubers outside. Bring them indoors to dry. You can tell that they are dry when there are no more wet spots on the tubers and any dirt left on them is dry.

Katy LTue, 11/11/2014 - 13:04

Thanks :)

The EditorsTue, 11/11/2014 - 10:39

In southern California you can wait until December to dig up your tubers and keep them stored until planting time again in early spring. Please see link below for some good advice.

http://sfdahlias.org/how.to.grow/calendar/calendar.htm

The EditorsThu, 11/06/2014 - 12:30

Hi Hilary,

Dig up the tubers and shake off as much soil as you can. Let the tubers dry before storing in a box or paper bags. You can wrap the tubers in newspaper or cover them with some light materials. See our suggestions under Harvesting/Storing on this page. Don't worry about pieces that break off. Store all the pieces and tubers and next spring when you take them out you'll see the "eyes" new growth.

The EditorsThu, 10/30/2014 - 15:10

It's recommended to cut dahlia stems back after a frost has hit the plants (the stems will turn brown). Depending on where you live in WA you may or may not need to dig the tubers for winter storage. If you live in the warmer regions of WA you can cover the plants with a thick layer of straw or other mulch. If you are unsure dig the tubers and follow our advice on this page for winter storage.

The EditorsFri, 10/24/2014 - 11:20

Hi Paula,

Put them back in the ground if you can. Otherwise put them in big containers with soil and leave them outside until you have your first frost. Then dig them up and store as usual. Good luck!

The EditorsMon, 10/06/2014 - 10:32

Congrats on your beautiful dahlias. We don't have pictures at this time, but here's what you do: Allow the tops to be nipped by the frost. That shuts everything down. Then dig and clean them by hand, but don’t use water, and dust each one with powdered sulfur for insect and disease protection (ask your garden center). Store the dahlias in paper bags in a dark, cool location that will not freeze. Plant them again in the spring when the danger of frost is past.

Bob BriggsTue, 10/21/2014 - 14:41

Your general article said to dig the tuber before frost, but your reply said to allow nip. ? I am in zone 5.

The EditorsWed, 10/22/2014 - 10:37

Hi, Bob, Dahlias may be hardy to USDA Zone 8. There they can be left in the ground to overwinter. In areas that get frost, including most parts of Zone 5, a killing frost—or a touch of frost—can help the bulb to shut down/go dormant. Foliage should be cut back to 2 to 4 inches above ground and lifting and separating should be completed.

We'll review the notes above. Thanks for bringing this to our attention.

Hal T.Mon, 10/06/2014 - 10:41

Allow the flower to dry thoroughly. The flower head can then be "harvested" for seeds. Simply pull the dry flower head apart and separate the seeds. You will quickly recognize them. I grew plants from seeds last year and developed 25 plants that all flowered throughout the summer. It was just an experiment but what great results. I will be digging them up soon and am anxious to see what sort of tuber development I have. Good luck to you.

The EditorsTue, 09/30/2014 - 11:04

Hi Edward,

You can wait to dig the tubers after the first frost. It is OK to divide the tubers before planting in the spring. Just make sure that each piece has a couple of "eyes" or buds.

The EditorsWed, 09/17/2014 - 15:09

The dahlias will not have time to bloom this fall. Store them in a dry dark place over the winter months and plant them in the spring (containers or in the garden).

The EditorsThu, 09/11/2014 - 09:36

If it's not a watering issue, you most probably have thrips (small bugs) eating your dahlia buds. If you store your bulbs over the winter, first dust them with powdered sulfur. Then spray with Orthene, an insecticide, as new growth begins next season. That will get rid of the thrips.

The EditorsMon, 09/08/2014 - 07:42

Dahlias are indeed a stunning flower. In your area, plant in the spring, preferable after April 1 so the soil's not too cold.

The EditorsThu, 08/07/2014 - 10:24

This is so seldom done, we're going to suggest this: Dig them with a fair bit of soil around the tubers and as little disturbance to the roots as you can manage, and put them into suitably large pots. If the flowers are mature or just past that stage, clip them. As you no doubt know, tubers should be lifted in fall, so you will have that part done. After the first frost, prepare them as usuall for the winter respite. Plant as usual next year.

The EditorsMon, 07/28/2014 - 16:40

We are not sure if there are any issues, however, we can advise that pinching encourages larger blooms. Also, notice that dahlias send out three buds; if you remove the two side buds and keep the center bud, you will have better quality blooms.

The EditorsThu, 07/24/2014 - 11:30

You can plant them in the ground. If your area has a warm Sept/Oct, you will be rewarded with a beautiful dahlia display.

The EditorsThu, 07/17/2014 - 07:47

If the plant and the buds appear healthy, the most common reasons that dahlias do not bloom are: 1) they are not getting enough direct sunlight or 2) they are getting too much nitrogenous fertilizer.

The EditorsTue, 07/01/2014 - 14:41

Your dahlias may have powdery mildew. Remove the leaves with white spots and check with your local nursery or garden store for an antifungal agent.

ChibimimiSat, 09/06/2014 - 18:14

Try sprinkling Milorganite around the plants. Deer don't like the smell and avoid the plants. This has worked well for me with my dahlias, hostas, and other deer magnets.

The EditorsFri, 06/20/2014 - 11:42

Do the best you can to get them into the ground. Survival as you describe is quite risky.

The EditorsWed, 06/04/2014 - 09:12

It doesn't sound promising, Tasha. Wrinked and/or shriveled tubers have missed their opportunity.

The EditorsWed, 06/04/2014 - 11:38

This is a relatively complicated process (that is, relative to planting in ground) but apparently quite do able.

Gardeners in Alaska do it, as shown in pictures here (http://www.alaskamastergardeners.org/Dahlias.html); note that specific lighting details are not provided.

Gardeners in Nove Scotia do it: More info on lighting is here https://sites.google.com/site/novascotiadahliasociety/gro...

And a gardener in Colorado does it and provides a lot of detail here: http://www.dahlias.net/seabox/lightem.htm

Hope this helps!

The EditorsFri, 05/23/2014 - 11:11

The dahlia is probably still in shock from being transplanted and moved outside into a sunny location. Wait a few days and see how it is doing.

DwolffeSat, 05/24/2014 - 13:03

Hello there. I was wondering if I could trouble you for some advice. I am attempting to grow flowers for my friends wedding and need all the help i can get. i bought dahlias from a local farm. They were in four packs and were about one 1/2 feet-2 feet tall and some were just starting to bloom. I am reading that you have to plant dahlias two feet apart at least. Is this true for the dahlias I bought, or is this more when you start them from tubers.... I have two options. One is a raised bed which is only about four feet by four feet and seven inches deep. The other is to plant dahlias in five gallon buckets. I was thinking one to each bucket though right now that seems insane to me. If I used the raised bed I'd space them about a foot apart, but don't want to crowd them. Any advice you can provide is greatly appreciated. I would like to at least have some flowers as filler for the wedding.

The EditorsWed, 06/04/2014 - 09:07

Another thought: Consider the size of the flowers when determing the space between dahlias, and that can be gleaned from the variety of the plant. Ask the folks at the local farm what type of dahlias they sold. "Dinner plate" dahlias produce very large blooms, for example, and would benefit from a lot of space between each.

The EditorsWed, 06/04/2014 - 11:49

Hi, Mig, Your dahlia could be in shock so give it a little time. Ideally the soil in the "new" pot is a combination of sterilzed potting soil (you don't want to contribute pest or problems to the mix), peat moss, and perlite. And you have set the tuber 1 to 2 inches deep, horizontally in the pot. And the tuber is not soaking wet. And it should get sun.

Hope this helps—

The EditorsFri, 05/23/2014 - 11:08

Dahlias do best in well-drained soil and don't like "wet feet". You can try to amend the soil with compost to make it drain better.

The EditorsFri, 05/23/2014 - 11:04

Hi Geneva,

Plant the tubers in the ground as soon as possible. Don't cut the shoots. This is normal and these are the beginnings of the new growth. The shoots are white because they have been enclosed in a black bag and not seen light.

Donnieg79Mon, 06/23/2014 - 17:53

Should those shoots be plant above ground of below?

The EditorsFri, 05/16/2014 - 16:21

Hi Angela,

Plant the dahlias early June for late summer blooms. When they start blooming keep cutting the flowers and the plants will grow bigger and bushier and produce more blooms.

Angela LSun, 05/18/2014 - 12:23

thank you for the response; this is very helpful!

The EditorsFri, 05/16/2014 - 16:16

Hi Phyllis,

Your dahlias will be fine. They do need some water so check them often to see if the soil is dry. Hopefully by now you already have some dahlias growing.

The EditorsTue, 04/22/2014 - 09:44

The dahlia foliage is blacked by frost damage. The roots, however, are still alive. Remove the frost kill and see if the plant recovers. If not, you may still be able to lift the roots and store.

The EditorsWed, 04/02/2014 - 10:55

We think of dahlias as flowers that do best in the ground, however, here is an article on The American Dahlia Society site all about how to grow dahlias in containers.

http://www.dahlia.org/index.php?page=growing-dahlias-in-pots

Hope this helps!

The EditorsTue, 02/18/2014 - 07:54

Dahlias are best grown in the ground. If you try containers, use a pot size no smaller than 12 x 12 inches per tuber. For pots, dwarf dahlias work best not standard sizes. Use 2 parts garden soil, 1 part potting soil that has not been treated in any way. Water and keep your soil slightly damp. After plants are 12 inches high, potted dahlias will require extra watering and fertilizing to promote proper blooming.

Lee ElliottThu, 03/20/2014 - 18:55

Dahlia's do not do well in pots unless they are big pots. They need at least 12' diameter of loose soil to grow properly and healthy, meaning 12" diameter at 8 to 10" deep, not just 12" diameter at the top of pot. If grown in small diameter you will get thick stem but only one or two and low flower productivity. Loose soil is important, hard pack soil is terrible for these flowers, not too much nitrogen either. They say you need to dig up every year, I find I get 3 to 5 years per plant and they keep producing without digging up as long as soil is loose and not hard pack. Best to grow in ground but remember, do not choke their room off underground, If you have hard clay dig a hole at least 12" deep and 12" diameter to the bottom and fill with good loose topsoil.

The EditorsTue, 02/11/2014 - 12:24

Although growing dahlias in very hot areas can be a challenge, some people have had success. Be sure that your dahlias are one of those varieties that are more heat tolerant. As you have, choose a site that is out of direct sun for part of the day, and be sure the soil is well-drained and rich. Shade during periods of high heat. Provide thick mulch (about 2 to 4 inches) to protect the roots. Mist during the day, to keep up the humidity, and water regularly. (The soil should be moist but not waterlogged.) Some gardeners in Zone 9 and warmer areas do not dig up the tubers except for about every 2 to 3 years to divide them. To overwinter in the ground, cut the stalks back to about 1 inch. (Some people place plastic or tin foil over the stalks to help prevent rot.) Then cover the stalks and tuber with about 6 inches of mulch. Water the area occasionally in winter, as needed, to prevent the tubers from drying. In spring, remove the plastic/tin foil covering (if using), and most of the mulch.

AzdonataTue, 02/11/2014 - 15:48

Thank you

Rob A.Thu, 04/17/2014 - 02:22

Just thought I'd chime in to let you guys know that I experimented with Dahlia tubers last year here in hot and quite humid Lahaina, in Hawai'i. I planted seven tubers, all in terra cotta pots that were big and deep. I am fascinated by the dinner plate type that produce huge blooms! I staked the pots as I knew they could get tall...low and behold, in 90 or so days, I had Kelvin Floodlight flowers that were as big as my head! Behind that, came the purple, not as big but still beautiful 8" blooms and so on... I left them in the sun all day long, but watered in the early am. and then again early pm. I have since removed all the grass from my front yard and have started 75 plants this year! yup, I am going crazy over "Dahlias"... Aloha!

Vickie BThu, 04/17/2014 - 11:30

WOW! I would love to see a picture of your dahlias you have started in your front yard!

AzdonataMon, 04/21/2014 - 21:18

I would love to see pics of your Dahlia garden

Mr Ashley FrancisFri, 03/25/2016 - 01:38

Glad to know of your success. In my teenage years my family lived in a city called Lahore in Pakistan some 45years ago and we grew beautiful dahlias in pots because the soil was clay and hard. Our gardener used mulch and watered them in early morning & after sunset,as daytime temperatures were in the 75-80F . I currently live in Toronto Canada and have adjusted to overwintering the tubers by digging them up after the first frost,washing the soil off the tubers and with a sharp knife making a hole through where the stalk meets the tubers.This allows the moisture to drain as I store these in my cold area of the basement. One year I left the newspaper wrapped tubers in the garage only to find then rotten in the spring, due to freezing conditions. Thought I would share this with you. It is hard to find dinner plate dahlias in Toronto,& that is my spring challenge.Maybe a drive south to NY or Buffalo may get results. Enjoy your Dahlias Happy Gardening. Ashley.

BreanneThu, 04/16/2015 - 21:28

Hi donata! How did the dahlias grow here in az? I purchased some bulbs and there is a lot of mixed answers to whether or not they will grow here and when to plant. I would be very interested to know if you had any success and any advice you could give me we be much appreciated! I also have some ranunculus bulbs that I am unsure of when to plant. Hearing that you have had success with yours gives me hope! Breanne

Niki PoolWed, 02/05/2014 - 19:24

Oops, forgot to mention, size! Is a pot slightly bigger than the tuber or is larger more ideal?

The EditorsTue, 02/11/2014 - 12:31

For full-size dahlias, a pot about 12 to 20 inches wide and deep (or wider) works well. (Taller varieties will do better with the larger sizes.) Ideally, plant only one tuber per container, although some gardeners have had success with more than one in a pot.

The BeaconFri, 02/07/2014 - 02:32

Terrible soil and California and not found in print with the rare exceptions of people who say they are from Cali. Chances are you garden on top of fill dirt in long but narrow beds. Since you live in a development and not a neighborhood, you lack the shade from mature trees. Just amend your soil and watch the refractive heat from the side of your building

The EditorsTue, 01/21/2014 - 12:40

It's a good idea to get an early start by planting the tubers in containers indoors and then planting them outdoors when the soil is nice and warm. Dahlias start blooming about 8 weeks after planting. Make sure to use large containers and keep them in a sunny warm area.

The EditorsMon, 01/13/2014 - 12:35

Hi Jessica,

Now is a good time to start the seeds indoors. Dahlias are easy to start from seed and they should germinate in 5 to 7 days. Use a good light potting mix and move the seedlings into bigger pots as they grow. Dahlias started from seed will bloom this summer but the plants may be smaller than dahlias planted from tubers.

ElisaSun, 01/19/2014 - 03:32

I just bought Dahlia bulbs at the store and I live near napa ca. Should I wait to plant? The package says between feb and march.

The EditorsFri, 12/06/2013 - 08:14

You'll be fine. Honestly, every gardener has a different approach. Here's more detail from a page that we like by the WSU extension: http://skagit.wsu.edu/MG/2007AA/102607.pdf

ShanfanSat, 05/31/2014 - 12:46

I agree you'll be fine. I live in Michigan having moved from the UK. The whole digging up for winter thing was new to me last Fall and when I dug up I split the clumps. I'd planted 2 tubers originally. This year I'll be finding space for 14! It's fine to split the tubers before storing! :)

The EditorsMon, 11/11/2013 - 10:04

Your dahlias may survive in the ground with an added thick layer of mulch, but digging and storing is a safer bet. See our information about storing the tubers on this page.

The EditorsThu, 10/31/2013 - 17:50

Yes, you can. Usually, dahlias are propagated from dividing the dahlia's clump of tuberous roots. That would be our preferred method. The reason to propagate from a cutting is to Propagating dahlias from cuttings is usually to preserve a valuable variety. You start roots indoors and take a cutting when the new shoots develop and there are two sets of leaves. Plant the cutting in a moist medium such as vermiculite at 1/2 inch to 1 inch deep. Keep the medium moist and warm at all times.

The EditorsThu, 10/31/2013 - 17:17

Yes, dahlias bloom in August and it's a perfect flower for special events.

You can contact a cut your own farm like this one in Portland, OR.

http://www.krugersfarmmarket.com/flowers.html

or check out other gardens that sell flowers in bulk for special occations.

http://www.lemeragardens.com/ is one example.

You can also ask your friends and family to plant dahlia tubers in the spring and then cut the blooms for your wedding in August.

Good luck!

The EditorsFri, 10/25/2013 - 16:04

Here's a nice page on how to save seeds from dahlias: http://www.jrg-dahlias.co.uk/how_to_save_seed.htm

The EditorsTue, 10/22/2013 - 15:19

You can store the dahlias in the pots. Just make sure that the garage doesn't get too cold in the winter. You can cover the pots with a blanket or tarp to give the bulbs a bit more protection. Also make sure that the soil is not too wet.

The EditorsFri, 10/04/2013 - 17:13

Make sure your plants have good drainage, and that they are set deep enough (6" or more). When the stalks brown and die around November, you can cut them back to just below ground level. Place plastic sheeting over the area, to protect the tubers from rot from winter rain. Next, add about 3 to 4 inches of mulch over the plants. In March, remove the mulch and plastic.

The EditorsFri, 10/04/2013 - 16:54

Yellowing leaves could mean several things, such as a fungus or virus, an insect pest (such as leafhoppers or aphids, which can spread viruses), or a cultural problem, such as heat or drought, or even overwatering. Make sure your plants have plenty of air circulation, good drainage, and only water when the soil feels dry down to about 1 inch below surface--the tubers can rot if overwatered. The soil should be dry, but not overly so. If a heat wave comes, try sheltering the plants with shade cloth or a screen of some kind. For fungus troubles, ask a garden nursery for the best control. For viruses, there is no cure, and the plants are best discarded. For leafhoppers or aphids, try applying insecticidal soap. For more advice about controls, you might check with a garden nursery.

The EditorsSat, 09/07/2013 - 14:53

We doubt they will survive in pots if you bring them indoors. Store the tubers (see above) and plant the following spring.

The EditorsSat, 10/05/2013 - 16:08

Yes, you will get tubers the first year. You can then propagate that plant via tubers in later years to get offspring of the same type. If you collect seed from your seed-grown plant, however, they will likely not be the same as the parent (in other words, not come true). Some people enjoy the variable results when growing 2nd generation seed, and save the newly formed tubers of those plants to grow in future years. Others prefer the predictability and quality of the plants when grown directly from tuber divisions (or also, cuttings). Note: The type of dahlias offered in seed packets are usually of the smaller bedding or dwarf variety, good for cut flowers and in borders and containers. If you want show-quality, huge blooms, go for cuttings or tuber divisions.

Note: We'd like to say thank you to the reader who disagreed with our original comment; we have corrected our response!

Su MacThu, 10/24/2013 - 22:40

WOW! So much great info in one paragraph! Just the answer this beginner was looking for, plus one or two things I would have never guessed about growing Dahlias from seeds. I thank you and my garden thanks you :) Sumac Mendocino Coast, CA

Su MacThu, 10/24/2013 - 23:12

Uhm, just one question: Exactly how far removed from "true" are third generation Dahlia seed pods? Does their beauty just become more unpredictable? Or should I not fall asleep near them? SM

The EditorsSat, 08/24/2013 - 04:09

Assuming they were planted correctly, you could use a high phosphorus fertilizer to encourage bloom. D not use a fertilizer containing nitrogen--it inhibits bloom, weak tubers, or rot.

The EditorsWed, 08/21/2013 - 15:22

It's a good practice to pinch (or prune) the center growth stalk. This will allow more laterals (side shoots) to grow and you'll get more flowers. For bigger blooms remove more stems and only keep three to five flowering stems per plant; for smaller blooms keep seven to ten stems.

The EditorsMon, 08/19/2013 - 15:28

As they are still tubers, store your dahlia tubers in a cool, dry place and plant in spring. See more comment on this page.

The EditorsThu, 08/15/2013 - 12:22

It's better to plant the dahlias in the ground before winter. After the first freeze cut the tops off and add a little mulch. Put a stake next to the dahlias so that you don't dig them up by accident next spring. Good luck!

The EditorsThu, 08/08/2013 - 10:02

Dahlias usually wilt because they are overheating with too much sun and warmth. Water regularly and move them to a location with less afternoon sun.

The EditorsThu, 08/08/2013 - 09:45

At this point, store your dahlia tubers in a cool, dry place.
We wouldn't use plastic. Put in a brown paper bag or layer in a cardboard box with newspaper. Sprinkle each tuber with some garden sulphur to eliminate any fungus or mold while they over winter. Plant in the spring after all danger of frost has passed and the soil temperature in the top 6 inches is at least 50 degrees or you risk decay and rot.

The EditorsTue, 07/30/2013 - 14:04

Anne, it's not clear if you dad's other dahlias grew but did not produce flowers, so we will assume that's the case.

Nonetheless, there is no easy answer. It may be that the nonbloomers got too much nitrogen (first number of the three on a fertilizer package should be low) and/or not enough light. Basic top soil is adequate.

That said, at least one source recommends giving the plant/s fish emulsion.

Another: Grow in morning sun, and be sure they get 6 hours of sun per day.

That's all we can say about this. The color factor is a puzzle. Why not ask the neighbor if he/she ever had this problem.

Best wishes!

Anne MorganTue, 07/30/2013 - 19:46

Thanks so much I will pass on the suggestions and ideas. Unfortunately his neighbor is no longer gardening or available to ask. Appreciate your help!

Bryson Gillenwater Sat, 08/17/2013 - 16:29

Possibly the tubers where eaten,rotted,have not been divided.

The EditorsMon, 07/29/2013 - 11:37

Dahlias are known for having a long blooming season. Each dahlia tuber will produce many blooms. After one flower is spent, be sure to deadhead the spent bloom which will encourage more flowering. Once established, dahlias like a deep watering 2 or 3 times a week with a soaker hose. You should add a nitrogen-soluble fertilizer every few weeks. In terms of hot weather: It's can make them limp along, but adding mulch and misting the plants can help them get through it. If you live in a warm place, buying heat-tolerant varieties is also a good idea!

Bryson Gillenwater Sat, 08/17/2013 - 16:31

Deadhead them. It will rebloom. If it does get cold put a plastic tarp over them.

The EditorsMon, 07/29/2013 - 11:11

Dahlias are hardy to zone 8 where they can be cut back and left in the ground to overwinter. In zone 7b, dahlias sometimes overwinter in the ground depending on the severity of the winter. It is recommended the tuberous roots be lifted and stored during the winter. Northern Utah has several different zones. See the USDA Hardiness Map for your zone: http://planthardiness.ars.usda.gov/PHZMWeb/

The EditorsSun, 07/28/2013 - 08:15

We're not familiar with a disease or pest that causes black buds. Perhaps you want to dig up one and see if you have rot? Sometimes dahlias are slow to grow when adjusting to a new place and survival rate is low for the first planting. Be sure to avoid nitrogen fertilizer until plants are close to flowering.

Betty A.Thu, 08/01/2013 - 19:30

Thank you.

Betty A.Tue, 08/13/2013 - 17:54

I talked to a commercial dahlia grower in my area; he said the buds were burned from the extreme heat we had for a few days.

The EditorsMon, 07/22/2013 - 13:19

There could be several reasons why a potted dahlia might wilt.

* Does the pot have good drainage? You don't want any water to sit in the pot at the base, which will encourage rot. Do you think that the store where you purchased it gave it reliable care, not overwatering it to start root rot (that is just now showing up in symptoms)?

* Was there a hot spell recently? Depending on where you live, where the pot is (on hot pavement or cool grass), and what the weather has been like, the plant may have gotten too much heat.

* There are several wilt diseases (fungal, viral, or bacterial) that appear first as wilting of lower leaves. Do the stems have any black or mushy areas? Are there any yellow streaks/veins on leaves or stems? If this is fusarium or verticillium wilt, or a virus, you should destroy the plant, and get rid of the soil (the pathogens live in the soil). Botrytis blight can cause browning of flowers. Stem rot causes leaves to yellow and wilt, roots to rot. To avoid disease, disinfect your tools with a dilute solution of bleach before you use them on each plant. Rotate where you plant dahlias each year (because some diseases overwinter in the soil). Provide good air circulation; allow soil to dry a bit before watering. If your soil is heavy, lighten it by adding some peat moss or similar soil amendment. Check tubers before winter storage for any signs of disease or insect problems; cut out any affected parts.

* Check for insects; entrance holes at the base of the stem; or tiny spots along the petals, base of the flower, or along the leaves. Sometimes thrips, aphids, or other sap-sucking insects can cause damage, such as ragged or brown areas on the flower, or wilting leaves. Borers can tunnel into the stems.

The EditorsTue, 07/16/2013 - 12:03

Dahlias bloom about 8 weeks after planting. They prefer to planted in the spring so they hit flowering mid-July or so. However, they may flower for you by September or October before the frost. Otherwise, you could just put them in storage through the winter. Since you live in NY, you'll need to dig them up either way in the fall and store over the winter. Pack in sawdust or peat moss in a cool, dark place. Don't let them get moist or they'll rot.

The EditorsMon, 07/15/2013 - 09:41

Deadhead the spent flower just above the point where the flower stem joins a main stem. Take care not to cut the buds!

The EditorsWed, 07/10/2013 - 12:01

It sounds like stem rot. White mold is encircling the stem, typically because the dahlias are growing in heavy or wet soil. The best treatment is: improving drainage and avoiding overcrowding. Also, rotate your plants to new sites occasionally.

The EditorsMon, 07/08/2013 - 11:22

Dahlias really don't bloom well indoors. You didn't say where you live, but if you live in a cold climate, you have to lift the tubers in the fall and store inside through the winter. When you bring inside, dust them with powdered sulfur. Spray with Orthene, a systemic insecticide, as new growth begins next season. That will reduce the bug population.

The EditorsMon, 07/08/2013 - 11:06

In New York, it's better to plant dahlias in the spring after the last frost--when the lilac bushes are in full bloom.

The EditorsMon, 07/08/2013 - 11:13

Thanks for your post! It's hard to diagnose the issue. Often, dahlias get "thrips." The best way to avoid this issue is drip irrigation or directing water onto the soil or mulch and not on the plants themselves.

The EditorsMon, 07/08/2013 - 10:58

It's possible that you just have a late blooming variety. This isn't uncommon. Assuming they were planted correctly, you could use a high phosphorus fertilizer to encourage bloom. Dont use a fertilizer containing nitrogen--it inhibits bloom.

The EditorsTue, 07/02/2013 - 11:44

Perhaps sprinkle some cayenne pepper or spray hot pepper in the pots as squirrels don't like that! For more drastic measures, ask your garden center if they have a repellent.

The EditorsFri, 06/28/2013 - 15:10

You may have thrips on your dahlias. Insecticidal soaps and horticultural oils are available at garden center for control of thrips and other common pests like aphids and spider mites. Reapply the soap or oil after it rains for continued control.

The EditorsMon, 06/24/2013 - 15:43

There could be several reasons. If the pot is well-drained, is the dahlia is getting plenty of water, but not too much to cause rot? Do you think that the store where you purchased it gave it reliable care, not overwatering it to start root rot (that is just now showing up in symptoms)? Have you fertilized the plant recently? Dahlias are big feeders (but use a low-nitrogen fertilizer; too much nitrogen will decrease flowering). Was there a hot spell recently? Depending on where you live, where the pot is (on hot pavement or cool grass), and what the weather has been like, the plant may be getting too much heat; if you think this is a possibility, try placing the pot in part shade for a while. There are several wilt diseases (fungal, viral, or bacterial) that appear first as wilting of lower leaves. Do the stems have any black or mushy areas? Are there any yellow streaks/veins on leaves or stems? If this is fusarium or verticillium wilt, or a virus, you should destroy the plant, and get rid of the soil (the pathogens live in the soil). Botrytis blight can cause browning of flowers. Check for insects; entrance holes at the base of the stem; or tiny spots along the petals, base of the flower, or along the leaves. Sometimes thrips, aphids, or other sap-sucking insects can cause damage, such as ragged or brown areas on the flower, or wilting leaves. Borers can tunnel into the stems.

The EditorsWed, 06/19/2013 - 16:35

Hi, Liz, Yes, you should stake it. Insert a cane and and tie it in as it grows. And you are correct: You need to pinch out the growing tips when your dahlias get to a height of 16 inches or so to encourage branching. Deadhead your blooms as they die off. According to the experts at RHS, "For giant blooms, restrict the number of flowering stems to three to five per plant; for smaller blooms allow seven to 10 flowering stems per plant. To produce a long-flowering display and strong stems, remove the two pairs of flower buds developing in the leaf axils below the terminal bud."

The EditorsMon, 06/17/2013 - 14:36

We've had dahlia tubers last a couple of years. There is no general rule. If they are stored in a cool, dark place and packed in sawdust or something that helps retain moisture, they might be OK. If they're wrinkled, they'll probably still grow. You just don't want them to be rotted! Try it out and see how it goes--and let us know!

The EditorsTue, 06/11/2013 - 15:26

Best time to plant dahlias in the south is March, early April. You will have best luck with short varieties that get no more than 30 inches tall. You don't need to store the tubers during the colder months. Just leave the tubers in the ground and they should come back the following spring.

The EditorsTue, 06/11/2013 - 14:55

Don't separate them but try to carefully move all 4 tubers together with the soil into a bigger pot. Or, you can leave them in the pot and separate them in the fall, after they are done blooming.

The EditorsTue, 06/11/2013 - 15:31

According to ASPCA dahlias are toxic to dogs and cats.

The EditorsTue, 06/11/2013 - 14:58

Yes, the more you cut dahlias, the more they will bloom. Dahlias look great in a vase indoors!

The EditorsFri, 06/07/2013 - 15:03

Select dwarf varieties for indoor use. Dahlias need a lot of light, at least 8 hours of bright sunlight. If you don't have a south facing window use grow lights above the pots. Fertilize every 2 weeks.

Akk0801Tue, 06/04/2013 - 10:12

I have always had more luck planting dahlia's in pots versus the ground. I live in Savannah, our soil is just too sandy.

MelinaWed, 06/25/2014 - 03:14

I just bought a pot of Dahlias and only have a patio so they will have to stay in a pot. Any idea how long it will live? DO you have tips to give on Dahlias in pots? This is my first time with them. Thanks!

The EditorsFri, 06/07/2013 - 14:55

If it is a big clump, break it up. Make sure each section has some "eyes" where the new growth will begin.

The EditorsWed, 05/29/2013 - 17:07

If you grow dahlias from seed, they will usually change color. If you grow from tubers, they will virtually always produce a plant identical to the parent.

Dahlias: How to Plant, Grow, and Care for Dahlia Flowers

Planting, Growing, and Caring for Dazzling Dahlias from Spring to Fall

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About Dahlia Flowers

Read Next

Planting

When to Plant Dahlias

Where to Grow Dahlias

How to Plant Dahlias

How to Plant Dahlia Tubers

Staking Dahlias

Growing Dahlias in Containers

Growing

Watering Dahlias

Dahlia Growing Tips

Types

Harvesting

Digging Up and Storing Dahlia Tubers

Readying for Summer

Gardening Products

Pests/Diseases

FAQ

Are Dahlias perennials or annuals?

Can you grow dahlias in pots?

Do deer eat dahlias? Are dahlias deer resistant?

When do dahlias bloom?

Can you grow dahlias from seed?

Wit and Wisdom

Catherine Boeckmann

Executive Digital Editor and Master Gardener

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