How to Grow Dirigo Ice Lettuce

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Dirigo Ice Lettuce

Lactuca sativa var. crispa

vegetable

Dirigo Ice is a crisp head lettuce variety known for its tight, dense heads with excellent crispness and fresh flavor. This heat-tolerant cultivar produces medium-sized heads suitable for both home gardens and commercial production. It offers reliable performance across various growing conditions and seasons.

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

Plant Dirigo Ice Lettuce
Around Apr 17

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

Watering, feeding, and pest-watch reminders.
Harvest Dirigo Ice Lettuce
Around Jun 11

≈ 55 days after planting

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

Growing Conditions

☀️

Sun: Full sun to partial shade; 6+ hours of sunlight daily preferred, afternoon shade beneficial in hot climates

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Water: Keep soil consistently moist but not waterlogged. Water deeply 1-2 times weekly, more frequently in hot weather. Provide 1-1.5 inches of water per week. Inconsistent watering can cause tip burn and bitterness.

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Spacing: 6-12 inches

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Days to maturity: 55-70

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Planting depth: 0.25-0.5 inches (seeds); transplants at soil level

Soil

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

pH: 6.0-7.0

Amendments:

Compost Well-rotted manure Peat moss or coco coir Balanced fertilizer (10-10-10)

Growing Zones

Find your zone →

Thrives in zones 3-8, can be grown spring through fall in most regions

2a 2b 3a 3b 4a 4b 5a 5b 6a 6b 7a 7b 8a 8b 9a

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Growth Stages

Seedling

7-14 days

Tiny cotyledons emerge with first true leaves appearing within 7-10 days. Plants are delicate with minimal foliage.

Keep soil consistently moist. Provide bright light (grow lights if indoors). Maintain temperature 60-70°F. Thin seedlings when they develop true leaves.

Early Vegetative

2-3 weeks

True leaves develop; plants form a loose rosette of bright green foliage. 4-6 leaves visible, plants are 2-3 inches tall.

Continue consistent watering. Begin light fertilization with diluted liquid fertilizer every 2 weeks. Ensure adequate light to prevent legginess. Maintain cool temperatures (60-65°F).

Head Formation

2-3 weeks

Plant develops additional leaves and begins forming a loose, then increasingly compact head. Leaves cup and overlap more noticeably, plant reaches 6-8 inches tall.

Maintain even soil moisture; do not allow to dry out. Continue fertilizing. Monitor for bolting (cold-induced). Thin if crowded. Provide afternoon shade in hot weather (above 75°F).

Head Maturation

1-2 weeks

Head becomes dense and compact with crisp, tightly overlapped leaves. Plant reaches 8-10 inches tall with firm head formation. Leaves are pale green to white at center.

Maintain consistent moisture to prevent tip burn. Reduce nitrogen fertilizer. Check regularly for harvest readiness by gentle squeezing. Harvest before temperatures exceed 75°F for best quality.

Harvest

Harvest window 3-7 days at peak quality

Head is firm, compact, and crisp with good color. Ready to harvest when head feels solid when gently squeezed and reaches desired size.

Harvest in early morning for maximum crispness and water content. Cut at soil level with sharp knife. Chill immediately after harvest. Can be harvested as whole head or leaves removed individually.

Companion Planting

Plan your garden →

Plant with:

Radish Carrot Onion Beet Strawberry Chervil Dill Chives Borage

Avoid planting near:

Cabbage Broccoli Cauliflower Parsnip Fennel

Common Pests

Spray with insecticidal soap or neem oil. Encourage beneficial insects like ladybugs. Remove affected leaves. Use reflective mulches to deter.
and (Gastropoda)
Hand-pick at dusk and night. Create barriers with diatomaceous earth or copper tape. Provide beer traps. Reduce moisture and hiding spots.
Use floating row covers on seedlings. Rotate crops. No chemical control once roots affected; remove plants. Maintain good drainage.
Spray undersides of leaves with insecticidal soap or neem oil. Use yellow sticky traps. Encourage air circulation.
Use floating row covers on young plants. Spray with neem oil or pyrethrin. Remove debris. Plant in cooler seasons when possible.

Uses

🍳

Fresh salads and green dishes

Culinary

Dirigo Ice is prized for its crisp texture and mild, pleasant flavor, making it ideal for fresh salads, wedge salads, and lettuce-based dishes. Its tight, compact head provides substantial yield and excellent presentation. [source]

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Sandwich and burger base

Culinary

The sturdy leaves hold up well in sandwiches and on burgers, providing a refreshing crunch and nutritional boost without wilting quickly. [source]

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Low-calorie nutritious green

Medicinal

Lettuce provides essential vitamins (K, A, C), minerals, and antioxidants. Contains lactucopicrin which may have mild sedative properties. Very low in calories while being nutrient-dense. [source]

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Hydrating food for wellness

Household

With approximately 95% water content, lettuce aids hydration and is commonly recommended in wellness and detoxification diets. Its high water and fiber content supports digestive health. [source]

🦋

Food for pollinators and beneficial insects

Wildlife

If allowed to bolt and flower, lettuce provides nectar and pollen for bees, butterflies, and other beneficial insects, supporting garden ecosystem 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 Dirigo Ice when heads are firm and compact, typically 55-70 days after planting. Harvest in early morning for maximum crispness and water content. Cut the entire head at soil level with a sharp knife, or remove outer leaves as needed. The plant is best harvested before temperatures consistently exceed 75°F, as heat triggers bolting and bitterness. Chill immediately after harvest and use within 1-2 weeks. Can also be harvested as cut-and-come-again lettuce by removing outer leaves while allowing center to continue growing.

Fun Facts

🌱 Dirigo Ice was developed by the University of Maine and is specifically bred for cool-climate growing and heat tolerance, making it an excellent choice for northern gardeners.
🌱 The name 'Dirigo' comes from Maine's state motto, meaning 'I lead' in Latin, reflecting the variety's development and breeding origins.
🌱 Lettuce has been cultivated for over 2,500 years, with evidence of its consumption in ancient Egypt, and crisp head varieties like Dirigo Ice are relatively modern developments originating in the 20th century.

Gardening Terms

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

Bolt Cultivar Full Sun Partial Shade True Leaves

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