How to Grow Lettuce, Iceberg
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Lettuce, Iceberg
Lactuca sativa var. capitata
vegetableIceberg lettuce is a crisp-headed variety known for its pale green, tightly packed leaves that form a compact, dense head. It is one of the most popular commercial lettuce varieties, valued for its long shelf life and crunchy texture. The mild flavor makes it ideal for salads, sandwiches, and fresh eating.
When should you plant Lettuce, Iceberg in your zone?
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Example Lettuce, Iceberg timeline · Pittsburgh, PA (Zone 6b)
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Plant Lettuce, Iceberg
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 Lettuce, Iceberg
Around Jun 16≈ 60 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Lettuce, Iceberg dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 3-10; best grown in spring and fall in most regions, summer in cooler zones
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Get my Lettuce, Iceberg timeline →Growth Stages
Seedling
10-14 daysTiny cotyledons emerge and develop first true leaves; very delicate stage
Keep soil consistently moist but not waterlogged; provide bright light to prevent legginess; thin seedlings to prevent crowding
Vegetative Growth
20-30 daysPlant develops 4-6 true leaves and begins forming the outer leaf structure; rapid leaf production
Maintain consistent moisture; ensure adequate spacing; provide balanced fertilizer every 2-3 weeks; monitor for pests
Head Formation
15-25 daysLeaves begin overlapping and curling inward; compact head structure starts to develop; pale inner leaves visible
Continue regular watering; avoid overhead watering to prevent leaf disease; reduce nitrogen to encourage head tightness; maintain consistent temperature
Mature Head
5-10 days before harvestFully formed, compact head with dense, crisp leaves; outer leaves are darker green, inner leaves pale and tender
Monitor for bolting in warm weather; maintain consistent moisture; check for pests; head should feel firm and heavy for its size
Harvest Ready
Harvest window is brief; 2-5 daysHead is firm, compact, and reaches 6-8 inches in diameter; leaves are crisp and well-formed
Harvest in early morning for maximum crispness; cut at soil level; use sharp knife to prevent bruising; chill immediately after harvest
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Spray with water to dislodge; use neem oil or insecticidal soap; encourage natural predators like ladybugs; use reflective mulches
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and
Hand-pick in early morning or evening; use beer traps; apply diatomaceous earth; remove debris and mulch piles nearby
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Remove affected leaves; use row covers on young plants; spinosad spray; encourage beneficial wasps
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Place collars around seedlings; hand-pick at night; apply diatomaceous earth at soil line; avoid excessive mulch near plants
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Use row covers; avoid planting in same soil year after year; solarize soil; use resistant varieties
Uses
Fresh Salads & Sandwiches
CulinaryIceberg lettuce is the classic choice for crisp salads, Caesar salads, and sandwiches due to its crunchy texture and mild flavor. Its sturdy leaves hold up well to dressings and toppings without becoming soggy. [source]
Wraps & Light Meals
CulinaryThe large, sturdy leaves make excellent wraps for various fillings, providing a low-carbohydrate alternative to bread. Individual leaves can be used for lettuce cups with Asian-inspired fillings. [source]
Nutritional & Hydration Support
MedicinalIceberg lettuce is 95% water and provides vitamins A, K, and folate, along with minerals like potassium. It is low in calories and can support hydration and nutrient intake as part of a balanced diet. [source]
Digestive & Wellness Properties
HouseholdLettuce contains trace compounds that have been traditionally used to support relaxation and mild digestive health. The fiber content aids in digestive function. [source]
Rabbit & Garden Animal Food
WildlifeIceberg lettuce is a favorite food for rabbits and other small garden animals, though excessive amounts should be avoided due to high water content. It provides food for beneficial insects and pollinators when plants bolt. [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 temperatures are cool and leaves are crisp. Cut the entire head at soil level with a sharp knife when it feels firm and compact, typically 6-8 inches in diameter. You can also harvest outer leaves individually for continuous production. Chill immediately after harvest to maintain crispness. Iceberg lettuce stores well in the refrigerator for 2-3 weeks if kept dry.
Fun Facts
- 🌱 Iceberg lettuce was named for the method of shipping it packed in ice across the United States in the early 20th century, not because of its color or crispness.
- 🌱 Iceberg lettuce is 95% water, making it one of the most hydrating vegetables you can eat, but also lower in nutrients compared to darker leafy greens like romaine or kale.
- 🌱 The variety was developed in the 1890s as an improvement to earlier crisphead varieties and has become the most commercially important lettuce variety in North America.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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