How to Grow Crystallina Lettuce

Crystallina Lettuce

Lactuca sativa var. crispa

vegetable

Crystallina is a crisp iceberg-type lettuce variety known for its tight, densely packed heads with a pale green outer leaves and blanched white interior. It offers excellent crunch and mild flavor, making it ideal for fresh salads and culinary applications. This cultivar is prized for its uniform head formation and extended shelf life.

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Example Crystallina Lettuce timeline · Pittsburgh, PA (Zone 6b)

Plant Crystallina Lettuce
Around Apr 17

Near Pittsburgh's average last spring frost.
Tend & protect
Late spring–summer

Watering, feeding, and pest-watch reminders.
Harvest Crystallina Lettuce
Around Jun 21

≈ 65 days after planting

Sample dates for Pittsburgh, PA. Sign up to get exact Crystallina Lettuce dates for your own zip code.

Growing Conditions

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Sun: Full sun to partial shade; 6 hours minimum, 6-8 hours optimal. In hot climates (zone 8+), afternoon shade beneficial.

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Water: Consistent moisture is critical. Water deeply 1-2 inches per week, keeping soil evenly moist but not waterlogged. Drip irrigation preferred to avoid wetting foliage, which encourages disease. Increase frequency during heat and lower during cool seasons.

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Spacing: 10-12 inches between plants; rows 12-18 inches apart inches

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Days to maturity: 65-75 days from transplant; 75-85 days from direct seed

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Planting depth: 0.25 inches (seeds); transplants should be set at soil line

Soil

Type: Well-draining, fertile loamy soil rich in organic matter

pH: 6.0-7.0

Amendments:

Compost or well-rotted manure (2-3 inches incorporated) Balanced fertilizer (10-10-10 or similar) Peat moss or coir for moisture retention

Growing Zones

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Thrives in zones 4-8; can be grown in cooler parts of zones 3 and 9 with season adjustment

3a 3b 4a 4b 5a 5b 6a 6b 7a 7b 8a 8b 9a 9b

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Growth Stages

Germination & Seedling

3-4 weeks

Seeds sprout in 7-10 days at 60-70°F. Seedlings develop first true leaves and grow slowly at this stage.

Keep soil consistently moist but not soggy. Provide bright light (grow lights 3-4 inches above seedlings for 14-16 hours daily). Maintain 60-70°F temperature. Thin direct-seeded plants to proper spacing early.

Vegetative/Leaf Development

3-4 weeks

Plant establishes root system and produces 6-8 leaves. Growth accelerates as plants develop secondary leaf layers.

Maintain consistent watering schedule. Apply balanced fertilizer every 2-3 weeks or use slow-release fertilizer at planting. Monitor for pest damage. Keep soil temperature 55-70°F for best results.

Head Formation

2-3 weeks

Outer leaves begin to curl and form a compact rosette. Interior leaves blanch and tighten into a dense head structure.

Reduce nitrogen slightly to avoid excessive leaf production at expense of head density. Maintain even moisture to prevent splitting or bolting. Provide adequate spacing for air circulation. Watch for signs of disease or pest pressure.

Head Maturity

1-2 weeks

Head becomes firm and dense with pale interior. Outer leaves reach full size; head diameter typically 6-8 inches.

Reduce watering slightly as head nears maturity to increase sugar content and crispness. Check head firmness by gently squeezing. Avoid overhead watering to prevent rot or disease at the crown.

Harvest

Harvest window 1-2 weeks before bolting

Mature head is firm, well-formed, and ready for cutting. Plant may begin to bolt if temperatures exceed 75°F consistently.

Harvest early morning when plants are most turgid and crisp. Cut heads at soil line with a sharp knife. Cool immediately to maximize crispness and shelf life. Remove outer leaves if damaged.

Companion Planting

Plan your garden →

Plant with:

Radish Carrot Beet Chives Parsley Dill Chamomile Marigold Nasturtium Strawberry

Avoid planting near:

Cabbage Broccoli Cauliflower Brussels sprouts Parsnip Fennel Celery

Common Pests

Spray with neem oil or insecticidal soap; encourage beneficial insects like ladybugs; reflective mulches can deter; strong water spray to dislodge.
and
Hand-pick in early morning; beer traps; copper tape barriers; diatomaceous earth; remove debris and dense vegetation; encourage natural predators like ground beetles.
Yellow sticky traps; remove infected leaves; neem oil spray; resistant varieties; control nearby weeds that harbor aphids.
Hand-pick caterpillars; Bacillus thuringiensis (Bt) spray; row covers; encourage parasitic wasps.
Improve air circulation; water at soil level, not foliage; remove infected leaves; sulfur dust; copper fungicide; resistant varieties; avoid overhead watering.
Ensure excellent drainage; reduce humidity with spacing and ventilation; remove affected leaves promptly; avoid wetting foliage; fungicides if severe.

Uses

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Fresh Salads & Crisp Dishes

Culinary

Crystallina's exceptional crunchiness and mild flavor make it ideal for fresh garden salads, cobb salads, wedge salads, and as a base for other salad compositions. The tight head structure holds dressings well. [source]

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Wraps & Lettuce Cups

Culinary

Whole or torn leaves serve as low-carb wraps for proteins, vegetables, and sauces, or as crisp vessels for Asian-style lettuce cups and appetizers. [source]

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Sandwich & Burger Use

Culinary

The sturdy, crisp leaves provide texture and moisture to sandwiches and burgers without wilting or becoming soggy when dressed. [source]

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Hydration & Light Nutrition

Medicinal

Lettuce is 95% water and provides dietary fiber, vitamin K, vitamin A, and folate with minimal calories, supporting hydration and general wellness. [source]

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Food Preservation & Storage

Household

Crystallina's excellent shelf life and dense head structure make it ideal for storage in root cellars, refrigerators, or modified atmosphere storage for extended availability. [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 when heads are firm and compact, typically 65-75 days after transplanting or 75-85 days from seed. Squeeze gently—a ripe head should feel solid with slight give. Cut at the base with a sharp knife in early morning for maximum crispness. Crystallina can be harvested as whole heads or outer leaves can be removed for cut-and-come-again harvesting (though this delays head formation). Store at 32-35°F with high humidity; properly harvested heads can last 2-3 weeks in the refrigerator. Avoid harvesting during peak heat—bolting occurs rapidly above 75°F.

Fun Facts

🌱 Crystallina is a type of crisphead or iceberg lettuce, which gets its name from the way growers historically packed heads with ice for shipping to markets in the early 1900s.
🌱 The tight, blanched interior of Crystallina heads occurs naturally as outer leaves shade the center, creating the pale, crisp heart prized by gardeners and chefs.
🌱 Lettuce is one of the oldest cultivated vegetables, with evidence of cultivation in ancient Egypt dating back to 4,500 BCE, though modern iceberg types like Crystallina are relatively recent developments from the 19th-20th centuries.

Gardening Terms

New to gardening? Learn about terms used in this guide:

Bolt Crown Cultivar Full Sun Partial Shade Transplant True Leaves

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