How to Grow Romana Lettuce
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Romana Lettuce
Lactuca sativa var. longifolia
vegetableRomana lettuce, also known as cos lettuce, is a crisp-leafed variety with elongated, upright growth and a firm heart. It's prized for its mild flavor, satisfying crunch, and nutritional density. This cool-season crop is a staple in salads and Caesar dressings.
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Example Romana Lettuce timeline · Pittsburgh, PA (Zone 6b)
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Plant Romana Lettuce
Around Apr 17Near Pittsburgh's average last spring frost.
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Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
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Harvest Romana Lettuce
Around Jun 16≈ 60 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Romana Lettuce dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 3-9; grows year-round in mild climates (zones 9-10)
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Get my Romana Lettuce timeline →Growth Stages
Seedling
7-14 daysTiny cotyledons emerge; first true leaves appear within 7-10 days
Keep soil consistently moist. Provide 12-16 hours of light daily. Thin seedlings to proper spacing once 2-3 true leaves appear.
Vegetative Growth
20-30 daysPlant develops 6-8 outer leaves; rosette widens and strengthens
Maintain consistent watering and cool temperatures (60-70°F ideal). Side-dress with nitrogen fertilizer every 3 weeks. Remove any damaged leaves.
Heart Formation
15-20 daysInner leaves curl inward, forming a dense, light-colored heart; plant reaches 8-12 inches tall
Continue consistent watering. Reduce nitrogen if plant begins to bolt prematurely. Monitor for bolting signals in warm weather.
Maturity
5-10 days at peak harvest windowHeart is fully formed, firm, and crisp; outer leaves are deep green; plant ready for harvest
Harvest before temperatures exceed 75°F for extended periods, or plant will bolt and turn bitter. Water early morning to maintain crispness.
Bolting
2-3 weeks until flower maturityPlant sends up a flowering stalk from the center; leaves become tough, bitter, and elongated
Once bolting begins, harvest immediately if desired, though quality declines. Plant will flower and set seed in 2-3 weeks if allowed to continue.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Spray with neem oil or insecticidal soap; encourage beneficial insects like ladybugs; use row covers on young plants.
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Hand-pick in early morning; use copper tape barriers; apply diatomaceous earth; beer traps; encourage natural predators.
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Use resistant varieties; rotate crops; destroy infested plants; avoid planting in same location for 2+ years.
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Hand-pick caterpillars; apply Bacillus thuringiensis (Bt); use fine row covers; encourage parasitic wasps.
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Use yellow sticky traps; spray insecticidal soap; neem oil; encourage natural predators; maintain air circulation.
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Improve air circulation; avoid overhead watering; use disease-resistant varieties; remove infected leaves promptly.
Uses
Fresh Salads & Caesar Dressing
CulinaryRomana's crisp, mild leaves are ideal for Caesar salads and fresh green salads. The sturdy outer leaves hold dressing well without wilting. [source]
Grilled Lettuce Dishes
CulinaryHalved romana heads can be grilled or roasted, developing a charred exterior and tender interior. Often drizzled with olive oil and served as a warm side dish. [source]
Wraps & Sandwiches
CulinaryLarge, sturdy leaves function as a low-carb bread substitute for wraps, sandwiches, and burger bases. [source]
Nutritional & Wellness Support
MedicinalHigh in vitamins K, A, and folate; contains lactucarium, a mild sedative compound traditionally used in herbal medicine for relaxation and sleep support. [source]
Composting & Garden Waste
HouseholdBolted plants and leaves unsuitable for harvest return nutrients to garden soil through composting, supporting future crop health. [source]
This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.
Harvest Tips
Harvest in early morning when leaves are crisp and hydrated. Cut the entire head at soil level once the heart feels firm (about 2 inches in diameter). Alternatively, harvest outer leaves individually while plant matures for continuous picking. Best harvested at 60-75 days before temperatures exceed 75°F, as warm weather triggers bolting and bitterness. Rinse, spin dry, and refrigerate promptly. Heads store 2-3 weeks in cold, humid conditions.
Fun Facts
- 🌱 Romana lettuce derives its name from Rome, Italy, where it has been cultivated since ancient times and is featured in classic Caesar salad, invented in Tijuana, Mexico in the 1920s.
- 🌱 Unlike iceberg lettuce, romana's sturdy midrib (the thick central vein) contains lactucarium, a mildly sedative compound that gives lettuce its scientific genus name, Lactuca, from the Latin 'lac' (milk).
- 🌱 Romana lettuce bolts and produces seed quickly in heat, but cool-season planting in spring and fall can yield two harvests annually in most climates; some gardeners succession-plant every 2-3 weeks for continuous supply.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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