How to Grow Purple-seeded Simpson Lettuce
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Purple-seeded Simpson Lettuce
Lactuca sativa var. crispa
vegetablePurple-seeded Simpson is a loose-leaf lettuce variety known for its frilly, deeply lobed green leaves with purple-tinged stems and seed pods. This cold-hardy, bolt-resistant variety is ideal for both spring and fall gardens, offering tender leaves perfect for salads and continuous harvesting.
When should you plant Purple-seeded Simpson Lettuce in your zone?
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Example Purple-seeded Simpson Lettuce timeline · Pittsburgh, PA (Zone 6b)
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Plant Purple-seeded Simpson 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 Purple-seeded Simpson Lettuce
Around Jun 1≈ 45 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Purple-seeded Simpson Lettuce dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 2-9, best for cool-season growing in spring and fall
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Get my Purple-seeded Simpson Lettuce timeline →Growth Stages
Germination & Seedling
2-3 weeksSeeds sprout in 7-10 days. Tiny seedlings emerge with first true leaves appearing within 2 weeks.
Keep soil consistently moist but not soggy. Provide bright light; thin seedlings to proper spacing if direct seeded. Maintain cool temperatures (60-65°F ideal).
Vegetative Growth
3-4 weeksLoose rosette of frilly, deeply lobed leaves develops. Leaves grow increasingly ruffled and develop purple tinges on stems and leaf margins.
Water regularly; mulch around plants. Apply balanced fertilizer every 2-3 weeks. Monitor for pests. Thin crowded plants if needed.
Leaf Development & Harvesting
2-3 weeks (ongoing if harvesting continuously)Mature outer leaves become harvestable (4-6 inches long). Plant continues producing new leaves from center if managed as cut-and-come-again.
Begin harvesting outer leaves when 4-6 inches long. Keep soil evenly moist. Watch for heat stress; provide afternoon shade if temperatures exceed 75°F.
Bolting (End of Season)
1-2 weeksCenter of plant elongates, flower stalk emerges, leaves become bitter and more rigid. Purple-tinged seed pods develop.
Harvest remaining leaves immediately as quality declines. Pull plant once bolting begins and replant with fall crop. Compost bolted plants.
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; use row covers on young plants
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and
Hand-pick; use copper tape barriers; set beer traps; apply diatomaceous earth; encourage ground beetles
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Use resistant varieties; practice crop rotation; apply neem oil; solarize soil before planting
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Spray with insecticidal soap; use yellow sticky traps; introduce parasitic wasps
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Improve air circulation; avoid overhead watering; apply sulfur or copper fungicide; remove infected leaves
Uses
Fresh salads and greens
CulinaryPurple-seeded Simpson's tender, frilly leaves are perfect for salads, sandwiches, and fresh cooking applications. The delicate texture and mild flavor make it ideal for gourmet salad mixes and garnishes. [source]
Continuous harvest greens
CulinaryThe cut-and-come-again harvesting method allows gardeners to enjoy fresh lettuce throughout the season from a single planting, providing weeks of tender leaves. [source]
Vitamins and minerals
NutritionalRich in vitamin K, vitamin A, folate, and antioxidants. Provides dietary fiber and contains beneficial compounds that support bone health and eye function. [source]
Cool-season microgreens
HouseholdPurple-seeded Simpson seeds can be sprouted as microgreens indoors in 10-14 days, providing nutrient-dense baby greens year-round. [source]
Pollinator and beneficial insect support
WildlifeWhen allowed to bolt and flower, Purple-seeded Simpson provides nectar and pollen for pollinators and beneficial insects that help control garden pests. [source]
Harvest Tips
Harvest outer leaves when 4-6 inches long, beginning 45-60 days from planting. Use cut-and-come-again method: snip leaves 1-2 inches above soil line with clean scissors, leaving center intact to regrow. Early morning harvest yields crispest leaves. For whole-head harvest, cut just above soil line when plant reaches desired size. Best harvested before bolting; quality declines in heat.
Fun Facts
- 🌱 Purple-seeded Simpson gets its name from its distinctive purple-tinged seeds and the Simpson family of lettuce varieties, which are prized for their frilly, attractive foliage.
- 🌱 This variety is notably bolt-resistant compared to many other lettuces, making it one of the most reliable choices for gardeners who struggle with early bolting in spring gardens.
- 🌱 The purple pigmentation in the stems and seed pods comes from anthocyanins, the same beneficial compounds found in blueberries and red wine.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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