Planting, Growing, and Harvesting Lettuce
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Planting
Lettuce prefers a location with 5 to 6 hours of sun, but can benefit from afternoon shade when temperatures soar. Soil should be loose, well-draining, and moist but not soggy. In the weeks prior to planting, amend with plenty of compost for added fertility.
Or grow lettuces in pots or tubs of potting soil. Lettuce prefers a bright, open position with good air circulation to promote strong, disease-free growth.
Lettuce is a cool-season crop, so in hot climates, you may get better results growing it in a cooler, shadier spot, especially as the young plants start out. Either way, lettuces don’t take long to reach maturity, which makes them an excellent choice for growing in between slower-to-establish crops such as corn or leeks.
When to Plant Lettuce
- Soil temperatures between 45°F and 65°F (7°C and 18°C) are ideal. Cold-adapted varieties can survive much lower temperatures.
- Make the earliest sowings under cover from late winter to grow on in greenhouse or hoop house beds for a super-early harvest. Then, from early spring, it’s time to sow for growing outside.
- Direct sowing is recommended. Sow seeds in the ground 2 to 4 weeks before your last spring frost date or as soon as the ground can be worked.
- Or, to get a head start, start seeds indoors about 1 month before your last spring frost date. Harden off seedlings for 3 days to a week before setting outdoors.
- If you are buying transplants (small plants) from a garden center or nursery, you may plant between 2 weeks before your last spring frost to 2 weeks after your last spring frost.
- In most regions, it’s possible to plant another crop of lettuce in the fall or even early winter. See our Planting Calendar for planting dates.
- Tip: To plant a fall crop, create cool soil in late August by moistening the ground and covering it with a bale of straw. A week later, the soil under the bale will be about 10°F (6°C) cooler than the rest of the garden. Sow a three-foot row of lettuce seeds every couple of weeks—rotate the straw bale around the garden.
How to Plant Lettuce
- Sowings may be made directly into prepared soil or into module trays of multipurpose potting soil. To sow directly, remove any weeds, then rake the soil level to a fine, crumbly texture. Mark out shallow drills, 8 to 12 inches or 20 to 30cm apart, using a string line as a guide if this helps. Then, sow the tiny seeds in clusters—a pinch of seeds every four inches or 10cm. Backfill the seed drills, label with the variety and water.
- Since the seed is so small, a well-tilled seedbed is essential. Stones and large clods of dirt will inhibit germination.
- Plant seeds 1/8 to 1/4 of an inch deep. Lettuce seeds need light to germinate, so don’t sow them too deep.
- Seeds may be sown in single rows or broadcast for wide-row planting (loose-leaf varieties are best for this). When broadcasting, thin 1- to 2-inch tall seedlings for the proper spacing.
- Spacing between plants depends on the variety:
- Loose-leaf lettuce: Plant or thin to 4 inches apart.
- Romaine (cos) and butterhead (loose-head, Bibb, Boston) lettuce: Plant or thin to 8 inches apart.
- Crisphead (iceberg) lettuce: Plant or thin to 16 inches apart.
- Set rows of lettuce 12 to 15 inches apart.
- Sow additional seeds every 2 weeks for a continuous harvest.
- Consider planting rows of chives or garlic between your lettuce to control aphids. They act as “barrier plants” for the lettuce.
- Water thoroughly with a mist nozzle at the time of transplanting or seeding.
For a fall crop, cool the soil in August by moistening it and covering it with a bale of straw. One week later, the soil under the bale should be a few degrees cooler than the rest of the garden and ready to be sown with a 2-foot row of lettuce. Repeat the process every couple of weeks by rotating the straw bale around the garden. As autumn temperatures decline, seed as usual for a fall harvest.
Growing
You can help transplants along at the start of the season by covering them with a temporary cloche made from bottomless milk cartons or plastic bottles. These will keep the chill off your seedlings just enough to help them acclimatize. Newly planted lettuces may also be helped with a simple row cover or fleece.
- Fertilize 3 weeks after transplanting with organic alfalfa meal or another slow-release fertilizer to provide a steady stream of nitrogen.
- Make sure the soil remains moist but not overly wet. It should drain well. Overwatering leads to disease or soft growth.
- Lettuce will tell you when it needs water. Just look at it. If the leaves are wilting, sprinkle them anytime, even in the heat of the day, to cool them off and slow down the transpiration rate. Using row covers can also help to keep lettuce from drying out in the sun.
- An organic mulch will help conserve moisture, suppress weeds, and keep soil temperatures cool throughout the warmer months.
- Weed by hand if necessary, but be careful of damaging your lettuce plants’ shallow roots.
Growing Lettuce in Containers
When you grow salad greens in containers, it can be different every day, as there are dozens of lettuce varieties along with other leafy edibles. What’s more, greens can grow in as little as 6 inches of soil! Some greens can be harvested in as little as a month’s time, and cut-and-come-again plants keep producing, often for weeks! In fact, the hardest part of “salad bowl gardening” may be deciding what to grow.
Choose a container that is 6 to 12 inches deep; a diameter of 18 inches is recommended. (Greater depth allows more room for roots and keeps the soil from drying out.) Moisten (do not soak) a portion of good-quality potting mix that is enough to fill your container to within an inch of the top. Direct-sow seeds densely—about 1⁄2 inch apart—on the prepared mix. Then cover with about 1⁄4 inch of dry potting mix, sprinkling it around. Tamp, or press, the seeds gently (a flat surface is recommended) so that they make contact with the soil and to keep them from blowing away. Water gently (a handheld pump container is advised instead of a hose, the water force from which can displace the cover soil and seeds). Keep the seedbed moist. (You can assess the wetness of the container by lifting it, as it will be lighter when dry.)
When seedlings are 4 to 6 inches tall, apply a balanced fertilizer at half strength. Continue watering as needed. Apply diluted fertilizer every 2 weeks, or per package directions. Protect greens from afternoon sun, if necessary and especially in summer, with shade cloth or row cover or by moving containers into shade. Plant more seeds in other containers every 2 to 4 weeks to maintain a fresh crop.
How to Delay Bolting
- Bolting is a common problem caused by warm temperatures (over 70°F/20°C) or changes in day length. When a lettuce plant bolts, it starts to produce a central stem and seed stalk, and leaves take on a bitter flavor.
- To delay bolting, cover plants with a shade cloth so that they get filtered light. Be sure to maintain watering throughout the warmest parts of the growing season, too.
- Planning your garden so that lettuce will be in the shade of taller plants, such as tomatoes or sweet corn, may reduce bolting in the heat of the summer.
Some of our favorite varieties include:
- Crisphead: ‘Great Lakes’, ‘Ithaca’, ‘King Crown’, ‘Mission’, ‘Summertime’
- Romaine (Cos)/Butterhead: ‘Burpee Bibb’, ‘Cosmo Savoy’, ‘Green Towers’, ‘Little Gem’, ‘Paris White Cos’, ‘Parris Island’, ‘Valmaine’
- Loose-Leaf: ‘Black Seeded Simpson’, ‘Green Ice’, ‘Ibis’, ‘Lollo Rossa’, ‘Oak Leaf’, ‘Prizehead’, ‘Salad Bowl’, ‘Slobolt’
- Red Leaf: ‘New Red Fire’, ‘Red Sails’, ‘Ruby Red’ (Not recommended for hot weather areas; the red pigment absorbs more heat.)
…But there are so many more types of lettuce to explore! What are your favorites?
Cooking Notes
Lettuce makes the perfect base for any number of salads. Try these eight great salad recipes with your harvest!
Catherine Boeckmann
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I live in zone 9a. Would you recommend drip or sprinkler irrigation for red leaf romaine, butter crunch, spinach etc for late October planting from plants already sprouted I picked up in flats from the garden center?
With leafy greens, such as lettuce or spinach, it’s important to not let them dry out. Therefore, drip irrigation would be the wiser choice, as it will give you consistently moistened soil. If you live in an area with low humidity and strong sun, you’ll want to make sure the leaves of the plants don’t dry out as well.
how do you grow iceberg lettuce I've tried but only got big leaves no head like in the grocery store what am I doing wrong? is it better to grow this kind of lettuce in the ground or in a pot on the deck?
Hi Anthony,
Iceberg lettuce is a variety of cabbage, which needs cool temperatures and plenty of water. It should be grown early in spring or in early fall, and does not do well in the summer heat. Mulch around the base of each cabbage head to retain moisture and keep the roots cool. For more advice, go here: http://www.almanac.com/plant/cabbage. We hope this helps!
I have a friend who needs about 5 kilos of butterhead lettuce. It's pretty hard to find them in Luzon. Do you know where they are sold?
organic manure is the best to feed on plants. Its important for the soil texture and roots navigation. Use any vegetation and lay it on the ground. soak it with water so that it could get rotten ,again it would attract organisms to feed , that way compost would be formed. The amount of debris should be sizeable . At least between one tonne and five is pretty fine. The pressure out of compression generates a lot of heat .I am an artist though but I HAVE MADE THIS OBSERVATION. kindly give me your comments
Hello my name is Karime Gonzalez. I'm carrying out a science project in which I choose to harvest lettuce. The project is basically to make something to help the community. So if you could tell me if you know how to make organic fertilizers I would really thank you.
if you take the leaves off the stalk will the plant die
With many varieties of lettuce, especially loose-left lettuce, you can keep harvesting from the plant. If the weather stays cool, you can keep harvesting from the plant several times or more.
how do you know if the lettuce has bolted, we are finished with are lettuce and want to collect the seeds.
