Planting Timeline
Showing dates for Red Leaf Lettuce in USDA Zone 7
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Red Leaf Lettuce · Zones 2–11
Growing Details
Zone-by-Zone Planting Calendar
| Zone | Indoor Start | Transplant | Direct Sow | Harvest |
|---|---|---|---|---|
| Zone 3 | — | — | April – August | June – October |
| Zone 4 | — | — | April – August | May – October |
| Zone 5 | — | — | March – September | May – November |
| Zone 6 | — | — | March – September | April – November |
| Zone 7 | — | — | February – October | April – December |
| Zone 8 | — | — | February – November | March – December |
| Zone 9 | — | — | September – March | November – May |
| Zone 10 | — | — | October – March | December – May |
Complete Growing Guide
Start your red leaf lettuce journey by preparing a site with morning sun and afternoon shade—this variety thrives with 4-6 hours of sunlight but appreciates protection from intense midday heat. Work 2-3 inches of compost into your soil along with a balanced organic fertilizer (10-10-10) at a rate of 1 tablespoon per square foot.
Direct sowing is your best bet for red leaf lettuce since it dislikes root disturbance. Plant seeds ¼ inch deep in rows spaced 12 inches apart, then thin seedlings to 6-8 inches apart once they reach 2 inches tall. For zones 3-6, start sowing 2-4 weeks before your last frost date—this variety handles light frost beautifully. In zones 7-9, focus on fall and winter plantings from August through February for best results.
If you must start indoors, use biodegradable pots and transplant the entire pot to minimize shock. Start seeds 3-4 weeks before transplanting and harden off for 5-7 days before moving outside.
Maintain consistent soil moisture—lettuce has shallow roots and wilts quickly when dry. Water at soil level rather than overhead to prevent disease. Side-dress with nitrogen-rich fertilizer (like fish emulsion) every 3 weeks to keep leaves tender and promote that vibrant red coloration.
The biggest mistake gardeners make is planting too thickly and failing to thin properly. Crowded plants bolt faster and develop bitter flavors. Another common error is stopping succession planting—sow new seeds every 2-3 weeks for continuous harvests.
To maximize yield, practice cut-and-come-again harvesting by taking outer leaves when plants reach 4-5 inches tall. This keeps the growing point intact for multiple harvests. In hot weather, provide afternoon shade using row covers or plant taller crops (like tomatoes) on the south side of your lettuce bed.
Harvesting
Begin harvesting red leaf lettuce when leaves reach 3-4 inches long and display their characteristic bronze-red edges with bright green centers—this typically occurs 30-35 days from sowing for baby leaves or 45-55 days for full-size heads. The leaves should feel crisp and snap cleanly when bent, not bend limply.
For cut-and-come-again harvests, use sharp scissors to cut outer leaves 1 inch above the soil line, leaving the central growing point intact. For whole head harvest, cut the entire plant at soil level when it reaches 6-8 inches across. Harvest in early morning when leaves are fully hydrated and crisp—afternoon-picked lettuce wilts faster and has a shorter storage life.
The red coloration intensifies in cooler weather, so don't worry if summer lettuce appears more green than red. Test leaf readiness by gently tugging—mature leaves release easily while young ones resist. Stop harvesting once you notice the center starting to elongate (bolting), as leaves will turn bitter quickly after this point.
Storage & Preservation
Fresh red leaf lettuce stores best when washed, thoroughly dried, and wrapped in paper towels inside a perforated plastic bag in your refrigerator's crisper drawer. Maintain humidity around 95% and temperature between 32-35°F for optimal storage life of 7-10 days.
Unlike sturdy vegetables, lettuce doesn't preserve well through traditional methods. Your best option for preservation is freezing cleaned, chopped leaves in ice cube trays with water or broth—these cubes work perfectly in smoothies or soups, though the texture won't suit fresh applications. Another option is dehydrating young, tender leaves at 95°F until crispy, then grinding into a nutrient-rich powder for seasoning soups and sauces. For immediate use, lettuce keeps 2-3 days at room temperature in a glass of water like cut flowers, but refrigeration significantly extends shelf life.
History & Origin
Red leaf lettuce varieties emerged from centuries of selective breeding of wild lettuce (Lactuca serriola) that originated in the Mediterranean region and western Asia. While loose-leaf lettuces have been cultivated since ancient Egyptian times, the development of consistent red-tinged varieties began in earnest during the 19th century as American and European gardeners selected plants with the most pronounced anthocyanin pigmentation.
The modern red leaf lettuce gained popularity during the 1970s health food movement when gardeners and commercial growers recognized that the red pigments indicated higher antioxidant content. Seed companies began stabilizing varieties that maintained consistent red coloration while preserving the mild, sweet flavor that made loose-leaf lettuces appealing to children and adults alike.
Unlike many modern hybrids bred for shipping durability, red leaf lettuce varieties were developed specifically for home gardeners and local markets where the delicate leaves could be harvested at peak quality. This focus on flavor and nutrition over storage life helped establish red leaf lettuce as a cornerstone of the home gardening renaissance that began in the 1980s.
Advantages
- +Exceptional bolt resistance in temperatures up to 75°F, extending harvest season significantly
- +Cut-and-come-again harvesting provides 3-4 harvests from a single planting
- +Vibrant red pigmentation intensifies in cool weather, adding stunning visual appeal to salads
- +Germinates reliably in soil temperatures as low as 35°F for early spring planting
- +Shallow root system makes it ideal for container gardening and succession planting
- +Mild, sweet flavor appeals to children and picky eaters who typically avoid bitter greens
- +Fast 30-day harvest cycle for baby leaves allows quick garden turnaround
Considerations
- -Red coloration fades significantly in hot weather above 80°F
- -Delicate leaves bruise easily during harvesting and washing
- -Susceptible to tipburn when soil moisture fluctuates dramatically
- -Short storage life of only 7-10 days even under optimal conditions
- -Aphids are particularly attracted to the tender new growth
Companion Plants
Plant Together
Chives
Repels aphids and other pests while improving lettuce flavor
Carrots
Deep roots don't compete with shallow lettuce roots, helps break up soil
Radishes
Quick growth helps break up soil and repels flea beetles
Marigolds
Deters aphids, whiteflies, and nematodes that attack lettuce
Spinach
Similar growing requirements and provides mutual shade in hot weather
Garlic
Natural pest deterrent against aphids, slugs, and other lettuce pests
Nasturtiums
Acts as trap crop for aphids and adds beneficial insects to garden
Dill
Attracts beneficial insects like ladybugs that control aphids on lettuce
Keep Apart
Broccoli
Large leaves create too much shade and compete for nutrients
Sunflowers
Allelopathic compounds inhibit lettuce growth and development
Fennel
Strong allelopathic effects inhibit growth of lettuce and most vegetables
Pests & Disease Resistance
Resistance
Good resistance to bolting in cool weather. Moderate downy mildew tolerance.
Common Pests
Aphids, slugs, flea beetles, cutworms
Diseases
Downy mildew, bottom rot, tipburn, lettuce mosaic virus