How to Grow King Arthur Lettuce
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King Arthur Lettuce
Lactuca sativa 'King Arthur'
vegetableKing Arthur is a butterhead lettuce variety known for its large, tender heads with excellent flavor and slow bolting characteristics. It produces dense, golden-green leaves with a creamy, buttery texture that makes it ideal for salads and fresh eating. This heirloom variety is prized by home gardeners for its reliability and ability to thrive in both spring and fall gardens.
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Example King Arthur Lettuce timeline · Pittsburgh, PA (Zone 6b)
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Plant King Arthur 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 King Arthur Lettuce
Around Jun 16≈ 60 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact King Arthur Lettuce dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Best in zones 4-8; can be grown in zones 3-9 with proper timing and temperature management
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Get my King Arthur Lettuce timeline →Growth Stages
Seedling
7-10 daysTiny cotyledons emerge and unfold into first true leaves; very delicate appearance
Keep soil consistently moist but not saturated. Provide bright light to prevent leggy growth. Thin seedlings to prevent crowding when first true leaves appear
Early Vegetative
2-3 weeksDevelops 4-6 true leaves forming a small rosette; leaves are light green and tender
Continue consistent watering. Ensure adequate light to promote compact growth. Begin fertilizing weekly with diluted liquid fertilizer. Thin to final spacing if not already done
Late Vegetative/Head Formation
2-3 weeksLeaves multiply and begin to form a loose head; outer leaves start overlapping; plant becomes more substantial
Maintain consistent soil moisture. Mulch around plants to retain moisture and keep soil cool. Watch for pests and disease. Side-dress with compost if needed. Avoid overhead watering to prevent fungal issues
Head Maturity
1-2 weeksForms a dense, full head with overlapping leaves; inner leaves are pale golden-yellow and buttery
Continue steady watering. Monitor for bolting (elongated flower stalk) especially in warm weather. Provide afternoon shade if temperatures exceed 75°F. Harvest when heads feel firm but before bolting begins
Harvest
Harvest window is 1-2 weeksHead is fully formed, firm, and at peak tenderness; ready for cutting or pulling
Harvest in early morning when leaves are crisp and hydrated. Cut head at soil level with a sharp knife or pull entire plant. Use immediately or store in refrigerator for up to 2 weeks
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Spray with insecticidal soap or neem oil; encourage beneficial insects like ladybugs; strong water spray to dislodge
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and
Hand-pick in early morning; use beer traps; copper tape barriers; diatomaceous earth; reduce watering frequency
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Use disease-resistant varieties; control aphid populations; remove infected plants immediately
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Improve air circulation; avoid overhead watering; remove affected leaves; fungicide if severe
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Collars around seedlings; remove debris where they hide; diatomaceous earth around plants; encourage predatory insects
Uses
Fresh Salads & Culinary Use
CulinaryKing Arthur's buttery, tender leaves are perfect for fresh salads, sandwiches, and wraps. The mild, delicate flavor and creamy texture make it ideal for salad greens without overpowering dressings. [source]
Braising & Cooked Preparations
CulinaryThe sturdy leaves hold up well to gentle cooking and can be braised with garlic and olive oil as a side dish or used in soups. [source]
Home Garden Staple
HouseholdKing Arthur is reliable and beginner-friendly, producing consistent heads with minimal special care. Its slow-bolting nature extends the growing season, making it valuable for continuous harvests. [source]
Beneficial Insect Support
WildlifeIf allowed to flower, King Arthur provides nectar and pollen for pollinators and beneficial insects that help control garden pests. [source]
Harvest Tips
Harvest when heads are firm and before bolting (flowering stalk emergence). Cut heads just above soil level in early morning for maximum crispness. King Arthur has good slow-bolt characteristics, extending the harvest window. For continuous harvest, pick outer leaves while allowing center to continue growing. Store unwashed heads in a plastic bag in the refrigerator for up to 2 weeks
Fun Facts
- 🌱 King Arthur is named after the legendary British king and represents an heirloom variety that has been passed down through generations of gardeners, maintaining its quality without modern hybridization
- 🌱 Butterhead lettuces like King Arthur have a natural waxy coating on their leaves that gives them their distinctive buttery appearance and texture, which also helps protect them from moisture loss
- 🌱 Lettuce is over 95% water and provides excellent hydration along with vitamins A, K, and folate, making it a nutrient-dense low-calorie food perfect for healthy eating
Gardening Terms
New to gardening? Learn about terms used in this guide:
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