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Always water at soil level to reach roots, never on the leaves or flowers
Wondering how much water flowers need to thrive? Whether you’re growing annuals in containers or perennial flower beds, proper watering is essential for healthy roots and long-lasting blooms. Learn how often to water flowers, how much moisture they need, and simple ways to conserve water while keeping your garden vibrant all season long.
Most flowers need about 1 inch of water per week, either from rainfall or irrigation. Container flowers usually require more frequent watering because pots dry out faster, especially during hot weather. Check the top 1–2 inches of soil and water when it feels dry.
Watering Flower Pots and Containers
Flowers and vegetables growing in pots have a limited amount of soil from which to draw moisture, and their roots can’t expand outward to search for more in dry weather. These are going to be your neediest plantings—especially those in sunny locations—so be sure to check them daily or even twice a day if the weather is hot and dry. Remember that wind also tends to dry out your plants more quickly, causing them to wilt.
When to Water Flower Pots
When it comes to containers, it’s better to look for cues on whether the plant needs water versus watering on a set schedule.
- Look at the soil color. Dry soil is lighter in color. Wet soil is darker in color.
- Check the pots to make sure the soil has not pulled away from the edge. If it has, water will just run down that space and right out of the pot instead of sinking in around the roots where it is needed. If necessary, add more soil to fill that gap.
- Put your finger in the soil, down to the first or second knuckle. Water only when the top layer (1 to 2 inches) of soil is dry.
- If the soil is too dry to hold water, put a tray under the pot to catch runoff; it will be reabsorbed through the drainage holes.
- Do not water at night (unless the plant is desperate for water), as this invites disease. Also, be sure to water the soil—NOT the leaves!
- Again, don’t set a schedule. When plants are small in the spring, they may need less water than when they grow larger and the weather gets hotter. Adjust accordingly!
How Much Water Do Container Flowers Need?
When you water, it’s important to keep watering until the water comes out of the pot’s drainage holes.
Of course, your pot must have drainage holes or the roots will become overwatered (waterlogged). At least one drainage hole is usually fine. That said, do not let your container sit in water. Make sure the water drains out.
It can take a surprising amount of water to thoroughly water a pot! A 10- to 12-inch pot may need up to a gallon of water. However, it’s very important that you are fully watering the root ball of the plant so that it can keep putting out roots and thrive.
If you water fully, you will also find you may not need to water quite as often. Of course, this completely depends on your weather and the size and type of container.
How to Revive a Dehydrated Flower Pot
If your plant and soil have become dehydrated (wilted plant, dried-out soil), you may find that the water just runs over the sides of the container. To rehydrate, there are two methods:
- Immerse the entire pot in a tub or bigger container of water. This works for smaller pots.
- Water fully (as described above). Wait 30 minutes. Keep watering every 30 minutes until the water starts to get absorbed by the soil. This extra TLC may take several rounds.
Watering Flowers in Garden Beds
Since flowers (and vegetables) planted in the ground have a larger area for their roots to run, they are a little more self-sufficient than those confined to containers.
How Much Water Do Flowers Need in the Ground?
The rule of thumb is 1 inch of water a week during the growing season, but we all know that some thirsty plants require more than that, while deeply rooted perennials and xeric plants are just fine with less.
- What is 1 inch of water? This means a 1-inch-deep layer of water over the entire soil surface that needs watering. The formula is essentially 1 inch of water per 1 square foot = 0.62 gallons. If you wish to get a sense of how much water that is, place 4 or 5 tuna cans (straight-sided) around the garden during a rainfall. When 1 inch of water from rain has collected in the containers, that indicates that 1 inch of water was applied to the soil.
- The easiest way to measure soil wetness is to buy a soil moisture meter; you can find them online for less than $10.
The Finger Test: An Easy Way to Check Soil Moisture
But nothing beats the finger test. Stick your finger into the soil about 2 inches down, and if it’s dry, it’s time to drag out the hose.
Why Midday Wilting Doesn’t Always Mean Your Flowers Need Water
Don’t be too alarmed if your plants wilt during the hottest part of the day. Wilting is a natural survival mechanism for many broad-leafed annuals. Once the sun gets lower, they should perk up again.
Watering Flowers After Planting
When planting flowering plants, make sure the rootball is wet and the ground is moist. Plant after a rain if possible.
Give the plants a good drink to settle the soil around their roots to lessen the shock of being transplanted. Plants that have a good start will perform better than those that have to struggle early on.
Tips to Use Less Water and Keep Flowers Healthy
In many parts of the country, water is at a premium, and using it for gardens and landscaping is at least limited, if not totally banned. What’s a gardener to do?
Water Deeply Instead of Frequently
To encourage your plants to develop deep roots, when plants need watering, thoroughly soak the ground once rather than applying many shallow waterings.
To reach the roots, the water has to go about 6 inches down into the soil. To test how far your water went, dig down after watering. You’ll be surprised! In a dry season, it can still be powdery.
Water the Soil, Not the Leaves
Again, be sure to water the soil and not the leaves. A gentle flow at the base of the plant will do more good than an overhead sprinkler that wets everything in its path. Soil splashing up onto the leaves can also spread disease.
Use Drip Irrigation and Soaker Hoses
Sprinklers also waste a lot of water, losing it to evaporation. Drip irrigation or soaker hoses will deliver the water right where it is needed and can be set with timers to turn on and off, making your job easier.
Water Early in the Morning
Try to water in the early morning or late afternoon rather than during the heat of the day, when most of the moisture will quickly evaporate.
Improve Soil With Compost
Look at your soil. Different soil types hold water better than others. If yours is too sandy, mix in compost, shredded leaves, coconut coir, well-rotted sawdust, or aged manure to increase its ability to absorb moisture.
Add Mulch to Retain Moisture
Mulch, mulch, mulch. After planting, adding a layer of straw, shredded leaves, bark mulch, or pine needles will keep soil moisture from evaporating quickly.
Choose Drought-Tolerant Flowers
Be mindful of microclimates. Some areas of your yard will be hotter and drier than others, while there may be spots where the ground stays moist longer. Try to take advantage of these natural conditions.
There are plenty of plants that don’t require huge amounts of water to thrive. Look for succulents or ones labeled as drought-resistant. Avoid plants that are water hogs (e.g., elephant ears, hydrangea). See best flowers for containers.
If your area suffers from continued drought, consider planting flowers that thrive on less water. Check out our list of 22 drought-tolerant plants.
Frequently Asked Questions
How often should you water flowers?
Most flowers need watering when the top 1–2 inches of soil become dry. Container plants may need daily watering during hot weather, while in-ground flowers often need about 1 inch of water weekly.
Is it better to water flowers in the morning or evening?
Morning is the best time to water flowers because it allows foliage to dry quickly and reduces the risk of fungal diseases.
Can flowers get too much water?
Yes. Overwatering can cause root rot and prevent roots from getting oxygen. Always use containers with drainage holes and avoid soggy soil.
Should you water flower leaves or the soil?
Water the soil around the base of the plant. Wet foliage can encourage disease and wastes water through evaporation.
How do you revive wilted flowers in pots?
Soak small pots in water or repeatedly water larger containers until the soil begins absorbing moisture again.
Are you a food gardener? Learn more about watering vegetables.
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