Master the art of growing crisp, tender lettuce from spring through fall with succession planting, proper soil preparation, and the right companion plants.
Lettuce (Lactuca sativa) is one of the oldest cultivated vegetables, with evidence of its cultivation dating back to ancient Egypt around 2680 BCE, where it was grown for its oil-rich seeds as well as its leaves. Today, it is a staple of home gardens worldwide, prized for its rapid growth and versatility. As a cool-season annual, lettuce thrives in temperatures between 45°F and 75°F, making it one of the first crops gardeners can plant in spring and one of the last they can harvest in fall.
Lettuce has a relatively low Growing Degree Day (GDD) requirement of 400-1,500 with a base temperature of 40°F, which is why it matures so quickly — typically 45-55 days for leaf lettuce and 60-80 days for heading types. This low GDD threshold means lettuce is ideally suited for spring and fall planting in most regions, and it can be grown year-round in mild winter climates like USDA zones 8-10. The key to success with lettuce is understanding bolting: when day length exceeds 12-14 hours and temperatures rise above 80°F, lettuce plants shift from leaf production to flowering, causing leaves to become bitter and tough. GDD data verified from university extension sources. Learn more about our data sources →
Lettuce varieties fall into four main categories, each with distinct characteristics and growing requirements. Understanding these categories helps you choose varieties that match your climate and harvest preferences.
Examples: 'Black Seeded Simpson', 'Red Sails', 'Oakleaf'. Loose-leaf varieties form open, loose heads and are the easiest to grow. They are ideal for cut-and-come-again harvesting — you can harvest outer leaves and the plant will continue producing for weeks. Recommended for beginners and for succession planting.
Examples: 'Buttercrunch', 'Bibb', 'Boston'. Butterhead lettuce forms loose, tender heads with a buttery texture and mild flavor. 'Buttercrunch' is an All-America Selections winner (1963) renowned for its heat tolerance, making it a good choice for gardeners in warmer zones.
Examples: 'Parris Island Cos', 'Little Gem', 'Rouge d'Hiver'. Romaine varieties form upright, elongated heads with crisp ribs. They are more heat-tolerant than butterhead types and have higher nutritional value — romaine lettuce contains significant amounts of vitamin A, vitamin K, and folate.
Examples: 'Iceberg', 'Great Lakes', 'Ithaca'. Crisphead lettuce forms tight, dense heads and requires the most specific growing conditions — cool temperatures, consistent moisture, and longer growing time. This is the most challenging type for home gardeners and is not recommended for hot-summer regions.
Lettuce has shallow roots, with most of the root system concentrated in the top 6 inches of soil. This makes soil quality particularly important. The ideal soil is moisture-retentive but well-drained, with a pH between 6.0 and 7.0. At pH levels below 6.0, lettuce growth is significantly reduced due to reduced availability of phosphorus and molybdenum.
Lettuce seeds are small — approximately 800-1,000 seeds per gram — and require light for germination. Sow seeds on the soil surface and cover with no more than 1/8 inch of fine soil or vermiculite. Seeds germinate best at 60-68°F and will typically emerge in 7-10 days. At temperatures above 80°F, lettuce seed enters thermodormancy and will not germinate — a common challenge for late-summer planting. In these conditions, start seeds indoors in a cool location or use a shade cloth over the seedbed.
For transplants, start seeds indoors 3-4 weeks before your intended outdoor planting date. Space plants 6-10 inches apart for leaf lettuce and 10-12 inches for heading types. Rows should be 12-18 inches apart.
The single most important technique for growing lettuce is succession planting — sowing new seeds at regular intervals so you have a continuous supply rather than a single glut. Because lettuce matures in just 45 days, you can achieve multiple harvests in a single growing season.
For a family of four, a planting of 10-15 lettuce plants every 2-3 weeks during the growing season provides a steady supply of fresh salad greens without overwhelming your kitchen.
Lettuce benefits from several companion plants that improve growth, deter pests, and make efficient use of garden space through intercropping.
Carrot (Daucus carota): Carrots and lettuce have complementary root depths — lettuce roots are shallow (6 inches), while carrot taproots extend deeper. This means they do not compete for nutrients and water. Plant carrots between lettuce rows. The lettuce will be harvested before the carrots need the full space.
Radish (Raphanus sativus): Radishes mature in just 21-30 days, making them an ideal intercrop with slower-maturing lettuce. Sow radish seeds in the same row as lettuce; the radishes will be harvested before the lettuce needs the space. Radishes also help break soil crust, improving germination for lettuce seeds.
Chives (Allium schoenoprasum): Chives and other alliums may help deter aphids, which are a common lettuce pest. The strong scent of chives is thought to mask the smell of lettuce from aphids. Plant chives at the corners of lettuce beds.
Plants to avoid: Avoid planting lettuce near parsley, as the two can compete for similar nutrients. Celery and lettuce can both attract aphids, so it is best to separate them. Fennel is allelopathic and should not be planted near any garden vegetables.
Consistent moisture is critical for lettuce quality. Because lettuce is 95% water by weight, even brief periods of drought stress cause leaves to become bitter and tough. Provide 1-1.5 inches of water per week through drip irrigation, soaker hoses, or careful hand watering. Avoid overhead watering, which can promote fungal diseases like downy mildew (Bremia lactucae) and bottom rot (Rhizoctonia solani). A 2-inch layer of organic mulch (straw, shredded leaves, or grass clippings) helps retain soil moisture and keeps the shallow roots cool.
Harvest lettuce in the early morning when leaves are at their crispest and most hydrated. After harvest, cool lettuce immediately by submerging in cold water, then dry thoroughly and store in the refrigerator at 32-36°F with high humidity (95%). Properly stored lettuce keeps for 7-10 days.
Stop guessing about planting dates. Our Garden Planner uses 30-year climate data for your exact location to calculate the optimal sowing dates for continuous lettuce harvests in your garden.
Get My Free Plan