← Plant Guides

How to Grow Blonde à Coeur Plein

Wikimedia Commons

Blonde à Coeur Plein

Lactuca sativa var. crispa

vegetable

Blonde à Coeur Plein is a heirloom French butterhead lettuce variety known for its tender, pale yellow-green leaves and creamy heart. This classic European cultivar produces loose, delicate heads with exceptional flavor and a silky texture that makes it prized for fresh salads and culinary applications.

When should you plant Blonde à Coeur Plein in your zone?

Get a personalized planting timeline — when to start seeds, transplant, and harvest — based on your USDA zone and local frost dates. Free to start.

Get my Blonde à Coeur Plein timeline →

Example Blonde à Coeur Plein timeline · Pittsburgh, PA (Zone 6b)

  1. Plant Blonde à Coeur Plein

    Around Apr 17

    Near Pittsburgh's average last spring frost.

  2. Tend & protect

    Late spring–summer

    Watering, feeding, and pest-watch reminders.

  3. Harvest Blonde à Coeur Plein

    Around Jun 11

    ≈ 55 days after planting

Sample dates for Pittsburgh, PA. Sign up to get exact Blonde à Coeur Plein dates for your own zip code.

Growing Conditions

☀️
Sun: Full sun to partial shade; 6-8 hours of sun daily optimal; afternoon shade beneficial in hot climates
💧
Water: Keep soil consistently moist but not waterlogged; water deeply 1-2 times weekly, more frequently in hot weather; avoid wetting foliage to prevent disease
📏
Spacing: 10 inches
📅
Days to maturity: 55-70 days
🌱
Planting depth: 0.25 inches; direct sow seeds or transplant seedlings started indoors 4-6 weeks before planting

Soil

Type: Well-draining, fertile loamy soil rich in organic matter
pH: 6.0-7.0
Amendments:
Compost Aged manure Peat moss or coco coir Balanced NPK fertilizer (10-10-10)

Growing Zones

Find your zone →

Thrives in zones 4-9; prefers cool seasons and bolts quickly in heat above 75°F

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

Sign up free to see if Blonde à Coeur Plein grows in your zone — and get a personalized planting timeline.

Get my Blonde à Coeur Plein timeline →

Growth Stages

1

Germination & Seedling

2-3 weeks

Seeds sprout within 7-10 days; tiny seedlings develop cotyledons followed by first true leaves

Keep soil moist; maintain temperature around 60-65°F; provide bright light to prevent leggy seedlings; thin direct-sown seedlings to proper spacing

2

Vegetative Growth

3-4 weeks

Plant develops 4-8 true leaves; loose rosette formation begins; foliage is pale green and tender

Maintain consistent moisture and cool temperatures; apply balanced fertilizer every 2-3 weeks; ensure adequate spacing for air circulation to prevent mildew

3

Head Development

2-3 weeks

Leaves begin to overlap and curl inward; a loose, delicate head forms with pale yellow-green inner leaves

Monitor for aphids and slugs; maintain cool temperatures (ideal 55-65°F); reduce nitrogen to encourage heading rather than excessive leaf growth

4

Maturity

Variable; harvest before temperatures exceed 75°F

Heads reach full size with creamy yellow hearts; leaves are tender and buttery in texture; plant is ready for harvest

Check heads for firmness by gently squeezing; harvest in early morning when leaves are crisp; watch for bolting signs (elongated stem, bitter flavor) especially in heat

5

Decline & Bolting

1 week or less

Warm temperatures trigger flowering; center leaves elongate; flavor becomes bitter; plant is past prime

Harvest immediately if this stage begins; pull plants and compost; plant new succession crop in cooler season

Companion Planting

Plan your garden →

Plant with:

Radish Carrot Beet Chervil Dill Parsley Chives Nasturtium Marigold Onion

Avoid planting near:

Cabbage Broccoli Cauliflower Kale Fennel Parsnip

Common Pests

  • Spray with water to dislodge; use insecticidal soap; introduce ladybugs; avoid excess nitrogen fertilizer

  • and

    Hand-pick in early morning or evening; use copper tape barriers; beer traps; encourage natural predators like ground beetles

  • No cure; prevent by controlling aphid vectors; use resistant varieties; remove infected plants; practice crop rotation

  • Improve air circulation; avoid overhead watering; apply sulfur-based fungicide; space plants adequately; remove infected leaves

  • Use yellow sticky traps; spray neem oil; introduce parasitic wasps; maintain cool temperatures

Uses

🍳

Fresh Salads & Delicate Greens

Culinary

Blonde à Coeur Plein is prized for elegant, tender salads with its buttery texture and mild, slightly sweet flavor. The pale yellow heart leaves are particularly valued in French cuisine for their delicate appearance and silky mouthfeel. [source]

🍳

Culinary Presentation

Culinary

The beautiful pale green outer leaves and creamy yellow heart make this variety ideal for plated dishes and restaurant presentations. Each leaf's natural curve and color gradient add visual elegance to composed salads. [source]

🏠

Garden Heritage & Heirloom Seed Saving

Household

As a classic heirloom French variety, Blonde à Coeur Plein is an excellent choice for gardeners interested in preserving heritage varieties and saving seeds for future seasons. Home seed production maintains genetic diversity in home gardens. [source]

💊

Nutritional & Wellness Benefits

Medicinal

Like all lettuces, Blonde à Coeur Plein provides dietary fiber, vitamins A and K, and folate with minimal calories. The tender leaves are easily digestible and valued in gentle, health-conscious cuisines. [source]

🦋

Pollinator & Beneficial Insect Support

Wildlife

When allowed to bolt and flower, Blonde à Coeur Plein produces small yellow flowers that attract pollinators and beneficial insects. The mature plant supports garden biodiversity in the later season. [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 feel firm but gently yield to pressure, typically 55-70 days after sowing. Cut entire plant at soil level with a sharp knife in early morning when leaves are crisp and cool; avoid harvesting in heat. For extended harvest, pick outer leaves individually while allowing center to continue growing. Use fresh immediately or store in refrigerator crisper for up to 2 weeks in high humidity.

Fun Facts

  • 🌱 Blonde à Coeur Plein translates to 'Blonde with a Full Heart' in French, referring to both its pale coloring and generous, creamy center that has made it a favorite in French gastronomy for over 100 years.
  • 🌱 This butterhead variety is exceptionally sensitive to temperature and day length, making it ideal for spring and fall crops in most climates but requiring shade and afternoon cool in summer growing regions.
  • 🌱 The scientific distinction between this and other butterhead lettuces lies in its specific leaf form and head formation; true Blonde à Coeur Plein maintains its pale coloration and delicate texture that distinguish it from modern hybrid butterheads.

Gardening Terms

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

Bolt Compost Cultivar Full Sun Heirloom Partial Shade pH True Leaves
Shop Blonde à Coeur Plein plants and related plants at Plant Addicts →

Join 30,000 gardeners planning their gardens with LizPlants.

Get your personalized Blonde à Coeur Plein planting timeline

Tell us your zip code and we'll calculate exactly when to start Blonde à Coeur Plein seeds, transplant seedlings, and harvest — based on your USDA zone and local frost dates. Includes calendar reminders and printable task lists. Free to start.

Get my Blonde à Coeur Plein timeline →