Simpson Elite
Lactuca sativa 'Simpson Elite'
An improved version of the classic Black Seeded Simpson, this loose-leaf lettuce offers exceptional heat tolerance and slower bolting. The bright green, deeply frilled leaves create a beautiful, productive plant that keeps producing tender leaves for weeks. Perfect for cut-and-come-again harvesting in warm weather when other lettuces struggle.
Harvest
45-55d
Days to harvest
Sun
Full sun to partial shade
Zones
2–11
USDA hardiness
Height
6-12 inches
Planting Timeline
Showing dates for Simpson Elite in USDA Zone 7
All Zone 7 lettuce →Zone Map
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Simpson Elite · Zones 2–11
Growing Details
Zone-by-Zone Planting Calendar
| Zone | Indoor Start | Transplant | Direct Sow | Harvest |
|---|---|---|---|---|
| Zone 3 | — | — | May – June | June – October |
| Zone 4 | — | — | April – June | June – October |
| Zone 5 | — | — | April – May | June – November |
| Zone 6 | — | — | April – May | May – November |
| Zone 7 | — | — | March – May | May – November |
| Zone 8 | — | — | March – April | April – December |
| Zone 9 | — | — | February – March | March – December |
| Zone 10 | — | — | January – March | March – December |
| Zone 1 | — | — | June – July | July – September |
| Zone 2 | — | — | May – July | July – September |
| Zone 11 | — | — | January – February | February – December |
| Zone 12 | — | — | January – February | February – December |
| Zone 13 | — | — | January – February | February – December |
Succession Planting
Simpson Elite bolts once daytime temps push consistently past 80°F, so in zone 7 you're working with two distinct windows. For the spring run, direct sow every 14 days starting around March 1, and make your last sowing no later than mid-April — that gives the final planting time to reach harvest (45-55 days) before heat arrives in late May or early June. Sow thinly in rows 12 inches apart, then thin to 6-8 inches once seedlings hit 2 inches tall.
For the fall run, count back 55 days from your first expected frost (around mid-November in zone 7) and start sowing in late August into September. Soil temps above 75°F suppress lettuce germination, which is the main obstacle at that time of year — a layer of shade cloth or light straw over the seed bed keeps things cool enough until the seedlings emerge. Fall plantings often outlast spring ones by several weeks before hard cold finally finishes them off.
Complete Growing Guide
Simpson Elite lettuce thrives when direct sown into the garden two to three weeks before your last spring frost, or started indoors four to six weeks prior for transplanting. This variety's exceptional heat tolerance means you can also direct sow in late summer for a fall crop, which actually produces superior quality leaves since cooler temperatures arrive as the plant matures. For spring planting, simply scatter seeds directly where you want them to grow; for indoor starts, sow into seed-starting mix and keep consistently moist until germination occurs in five to ten days.
Space Simpson Elite seedlings or thin direct-sown plants to six inches apart, as this loose-leaf variety needs adequate air circulation around its deeply frilled leaves. Sow seeds just barely ¼ inch deep—they need light to germinate effectively. Prepare your garden bed with rich, well-draining soil amended with compost; Simpson Elite produces prolifically when given plenty of organic matter to draw nutrients from, and good drainage prevents the bottom rot problems that plague this species in waterlogged conditions.
Water consistently and deeply, providing about one inch per week through drip irrigation or soaking rather than overhead spraying. Overhead watering on Simpson Elite's intricate, ruffled foliage creates an ideal environment for downy mildew, which shows as yellowish patches on upper leaf surfaces. Feed with a balanced liquid fertilizer every two weeks once plants are established, as the extended harvest period demands sustained nutrition.
Simpson Elite's improved vigor means it resists bolting far better than its Black Seeded Simpson ancestor, yet it still attracts the same pest lineup. Monitor closely for aphids clustering in the leaf folds—they love the protected spaces created by those frilly leaves. Slugs and snails feast on outer leaves, while flea beetles create tiny shot-hole damage on young plants. Floating row covers protect seedlings from flea beetles until plants are established. Leaf miners tunnel through foliage later in the season; remove affected leaves promptly.
The key technique that separates adequate harvests from exceptional ones with Simpson Elite is cut-and-come-again harvesting. Rather than harvesting entire plants, pinch or cut outer leaves once the plant reaches six to eight inches tall, leaving the center intact. This approach keeps Simpson Elite producing tender leaves for six to eight weeks or longer, far exceeding the quoted 45-55 day harvest window. Succession plant every two weeks for continuous supply.
Many gardeners fail to recognize that Simpson Elite's heat tolerance is a license to push its planting season later into spring than traditional lettuces allow. While most leaf lettuces decline by early summer, Simpson Elite actually thrives as temperatures warm, making it invaluable for the gap period when spring crops bolt but summer heat hasn't yet arrived.
Harvesting
Simpson Elite reaches peak harvest readiness when outer leaves display vibrant bright green coloring and measure four to six inches long with a tender, crisp texture that snaps cleanly when bent. This cultivar truly excels with cut-and-come-again harvesting, where you remove outer leaves consistently while the plant continues producing from its center, extending productivity for weeks. For optimal results, harvest in early morning when leaves are fully hydrated and crisp, avoiding the heat of midday. Single complete harvests are possible but waste the variety's exceptional regenerative capacity; instead, begin harvesting outer leaves when the plant reaches six inches tall and continue selective picking every few days to maintain tenderness and encourage ongoing growth throughout the warm season.
Tiny seeds with a dandelion-like tuft (pappus) to aid in wind dispersal.
Color: Brown/Copper. Type: Achene. Length: < 1 inch. Width: < 1 inch.
Harvest time: Summer
Edibility: Leaves can be used raw or cooked in salads, sandwiches, and other dishes. Head lettuce can be stored for 2-3 weeks while leaf and butterhead store for 1-2 weeks.
Storage & Preservation
Store freshly harvested Simpson Elite in perforated plastic bags in your refrigerator's crisper drawer at 32-36°F with high humidity. Properly stored leaves maintain quality for 7-10 days – longer than most lettuce varieties thanks to Simpson Elite's sturdy leaf structure.
Before storing, gently wash leaves in cold water and spin dry thoroughly. Excess moisture promotes rot, while completely dry leaves wilt faster. Layer clean leaves between paper towels in storage containers to absorb excess moisture.
Simpson Elite preserves well through lacto-fermentation – chop leaves and ferment with 2% salt brine for 3-5 days to create a tangy, probiotic-rich condiment. Dehydrating at 95°F produces crispy lettuce chips that store for months in airtight containers. While freezing isn't ideal for fresh eating, blanched Simpson Elite works well in cooked dishes and smoothies when frozen in ice cube trays with water or broth.
History & Origin
Simpson Elite is an improved selection of the Black Seeded Simpson, a loose-leaf lettuce with deep American heirloom roots dating back to the 19th century. The original Simpson variety became widely cultivated across the United States for its productivity and heat tolerance, establishing it as a reliable garden standard. Simpson Elite represents modern breeding refinement of this classic line, selecting for enhanced heat tolerance and delayed bolting—traits critical for summer production when many lettuce varieties falter. While specific breeder attribution and introduction year for Simpson Elite itself remain undocumented in readily available sources, the variety clearly emerged through commercial seed company development building upon the proven Simpson genetic foundation. This lineage ensures both reliability and adaptation to contemporary gardening challenges.
Origin: Mediterranean to Siberia
Advantages
- +Exceptional heat tolerance makes Simpson Elite ideal for summer gardens
- +Slow bolting extends harvest window compared to standard Black Seeded Simpson
- +Deeply frilled leaves provide beautiful presentation and excellent cut-and-come-again yields
- +Mild, sweet flavor remains crisp without bitterness even in hot weather
- +Easy cultivation makes Simpson Elite perfect for beginner gardeners
Considerations
- -Susceptible to downy mildew in cool, humid growing conditions
- -Vulnerable to multiple pest pressures including aphids, flea beetles, and slugs
- -Lettuce mosaic virus poses serious risk in contaminated garden environments
Companion Plants
Radishes are the most practical companion to slot in with Simpson Elite. They germinate in 5-7 days, their presence disrupts flea beetles before those beetles start punching holes in your lettuce, and they're pulled well before the lettuce canopy fills in — no competition, no overlap. Chives and garlic work well along row edges for a different reason: their sulfur compounds actively repel Myzus persicae, the green peach aphid that vectors lettuce mosaic virus. That's a documented mechanism, not a folk remedy.
Carrots root down past 12 inches while Simpson Elite stays shallow, so the two genuinely don't compete for moisture or nutrients at 6-inch spacing. Nasturtiums are worth planting nearby as a trap crop — aphid colonies tend to pile onto them instead of your lettuce, concentrating the problem somewhere you can actually deal with it.
Fennel is allelopathic to most vegetables, and lettuce is particularly sensitive to it; anything planted within 18-24 inches tends to underperform. Broccoli is a different problem: it's a heavy nitrogen feeder, and in our zone 7 Georgia garden both crops want the same cool-season bed at the same time. You end up with two hungry plants splitting limited fertility instead of one crop thriving. Run them in separate beds.
Plant Together
Chives
Repels aphids and improves lettuce flavor while providing natural pest deterrent
Carrots
Root depth complements shallow lettuce roots, maximizes garden space efficiency
Radishes
Quick-growing crop that loosens soil and can be harvested before lettuce needs full space
Marigolds
Deters nematodes, aphids, and whiteflies while attracting beneficial insects
Spinach
Similar growing requirements and can provide wind protection for tender lettuce leaves
Nasturtiums
Acts as trap crop for aphids and cucumber beetles, protecting lettuce from pest damage
Garlic
Natural fungicide properties help prevent damping-off and other soil-borne diseases
Dill
Attracts beneficial insects like ladybugs and lacewings that control lettuce pests
Keep Apart
Broccoli
Competes heavily for nutrients and creates too much shade for optimal lettuce growth
Fennel
Releases allelopathic compounds that inhibit germination and growth of lettuce
Sunflowers
Creates excessive shade and competes aggressively for water and soil nutrients
Nutrition Facts
Per 100g serving. % Daily Value based on 2,000 calorie diet. Source: USDA FoodData Central (FDC #2346388)
Pests & Disease Resistance
Resistance
Excellent heat tolerance and bolt resistance. Good downy mildew resistance.
Common Pests
Aphids, slugs, snails, flea beetles, leaf miners
Diseases
Downy mildew, bottom rot, lettuce mosaic virus
Troubleshooting Simpson Elite
What you'll see, why it happens, and what to do about it.
Seedlings collapse at soil level within the first 7-10 days after transplanting or germination — stems look pinched or water-soaked at the base
Likely Causes
- Damping off — a fungal complex (most often Pythium or Rhizoctonia solani) that thrives in cold, wet, poorly drained soil
- Overwatering or heavy clay soil holding moisture too long after a rain
What to Do
- 1.Pull the dead seedlings and dig around the base — brown, mushy roots confirm damping off; don't replant lettuce in that spot this season
- 2.Mix compost or coarse perlite into the bed before the next sowing, and raise the bed at least 4-6 inches if you're in a low spot
- 3.Start fresh seed in a different location or container; NC State's IPM guidance recommends rotating lettuce out of beds with a history of seedling loss
Gray-purple fuzzy coating on the undersides of older leaves, with yellow angular patches on the upper surface — shows up in cool, wet stretches
Likely Causes
- Downy mildew (Bremia lactucae) — spreads fast at 50-65°F with high humidity or persistent leaf wetness
- Overhead irrigation or dense planting that keeps foliage wet overnight
What to Do
- 1.Strip off and trash affected leaves immediately — do not compost them
- 2.Switch to drip or soaker irrigation to keep water off the foliage
- 3.Space plants at least 8 inches apart; Simpson Elite's loose-leaf habit helps airflow, but crowding still creates pockets of stagnant moisture
Leaves show irregular mosaic patterning — alternating light and dark green patches, sometimes with puckering — on plants that otherwise appear to be sizing up normally
Likely Causes
- Lettuce mosaic virus (LMV), transmitted by aphids, primarily Myzus persicae (green peach aphid), moving in from nearby weeds or bolting brassicas
- Starting from infected seed lots
What to Do
- 1.Check leaf undersides for aphid colonies; a firm spray of water clears light infestations, and insecticidal soap handles heavier ones — repeat every 4-5 days
- 2.Pull symptomatic plants — there's no cure once a plant is infected, and leaving them in the bed keeps the virus reservoir active
- 3.Source certified LMV-indexed seed when possible, and clear wild mustard and other weedy hosts from within 10 feet of your lettuce rows
Frequently Asked Questions
How long does Simpson Elite lettuce take to grow?▼
Can you grow Simpson Elite lettuce in containers?▼
Is Simpson Elite good for beginners?▼
When should I plant Simpson Elite lettuce?▼
What does Simpson Elite lettuce taste like?▼
Simpson Elite vs Black Seeded Simpson - what's the difference?▼
Growing Guides from Wind River Greens
Where to Buy Seeds
Sources & References
External authority sources used in compiling this guide.
See the Methodology page for how this data is sourced, what's AI-assisted, and known limitations.