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How to Grow Lettuce from Seed

easyGardeninghalf day

Learn how to cultivate crisp, fresh lettuce from seed with this comprehensive beginner's guide. Whether you are starting your plants indoors or sowing directly into the garden, you will discover the ideal planting techniques and environmental controls needed for a successful harvest.

Safety Warnings

  • Wash hands thoroughly after handling soil or compost.

Tools Needed

Transplant trays — Multi-cell plastic trays with drainage holes
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Garden shears — Sharp scissors or harvest knife
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Materials

Lettuce seeds — Varieties such as Black Seeded Simpson, Romaine, or Butterhead(1 packet)
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Seed-starting mix — Lightweight, sterile, well-draining commercial mix(As needed)
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Nitrogen-rich fertilizer — Liquid fish emulsion or bat guano(As needed)
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Mulch — Grass clippings, straw, or dried leaves(1-3 inches deep)
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Steps

1
Prepare the planting area. If starting indoors, fill transplant trays or pots (at least 5 inches deep) with a sterile, lightweight seed-starting mix. For direct outdoor sowing, prepare a bed with rich soil.
2
Sow the seeds. For trays, make a small depression in each cell and place 2-3 seeds. For direct sowing, plant seeds 1/4 to 1/2 inch deep and approximately 1 inch apart. Lightly cover seeds with soil and mist with water.
Lightly cover with soil 2-3 seeds Seed mix Plastic tray Cross-section · Ensure seeds are barely covered to allow light for germination
3
Manage germination and early growth. Keep the environment cool, as lettuce is a cool-season crop and may fail to germinate in soil temperatures above 80°F. Mist daily until sprouts emerge, typically within 8-10 days.
4
Thin and care for seedlings. Once seedlings develop their first few leaves, thin them so only one healthy plant remains per cell or space them 1 inch apart. Provide at least 6-8 hours of bright light or use grow lights 6 inches above the plants.
Remove weak seedlings Strong plant Starter tray True leaves Thin seedlings to one healthy plant per cell to prevent crowding
5
Transplant to the final location. Move seedlings to a semi-shaded area to protect them from extreme heat. Space plants 4-6 inches apart. Firm the soil around the root ball and water thoroughly to eliminate air pockets.
firm soil around ball Seedling Root Ball Native Soil Cross-section: Gently compress soil to remove air pockets around roots
6
Maintain plant health. Water frequently to keep soil moist but not soggy. Apply a nitrogen-rich fertilizer to promote vegetative leaf growth. Optionally, apply 1-3 inches of mulch (straw or grass clippings) to protect roots from heat and evaporation.
7
Harvest the lettuce. Beginning 30-45 days after planting, use the 'cut and come again' method by slicing off the largest outer leaves without damaging the center crown, or harvest the entire head by severing it at the root.
slice outer leaf center crown garden shears root zone Cut and come again · Harvest outer leaves to allow the center to keep growing

Pro Tips

  • Perform a 'tug test' 7-10 days after transplanting; if the plant doesn't move, the roots are well-established.
  • Harvest in the morning when the plant is most hydrated for a healthier yield.
  • Store harvested lettuce in the refrigerator with a damp towel to maintain crispness without causing mold.

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