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Dark Green Cos Lettuce Seeds

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Dark Green Cos Lettuce

SKU: LC10-750

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Country Of Origin: USA USA

Availability: Out of stock

Price: $3.00

Your price: $2.50

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Planting instructions
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65 days. Lactuca sativa. Open Pollinated. Dark Green Cos Lettuce. The plant produces excellent yields of flavorful dark green lettuce. The leaves are tender, crisp, and thick with a sweet flavor. Perfect for Caesar salads and garnishes. Suitable for hydroponic gardening. Also known as Dark Green Romaine Lettuce. Suitable for containers and patios. Excellent choice for home gardens and market growers. United States Department of Agriculture, PI 543966. A variety from the USA.

Lot No: 102698

Germination: 85%

Test Date: 08/2025

Seeds Per Pound: 400,000

Plant Height: 5 to 10” Tall

Planting Season: Spring/Fall

Sunlight Requirement: Full Sun/Partial Shade

Planting Method: Direct Sow/Indoor Sow

Romaine Lettuce Lactuca sativa

Seed Depth

Soil Temp. for Germination

Days to Germination

Sunlight Requirements

Planting Time

1/4 to 1/2"

70 F to 85 F

7 to 10 days

Partial Shade/Full Sun

Spring/Fall

USDA Hardiness Zone

Seed Spacing

Row Spacing

Space After Thinning

Days to Harvest

N/A

18"

12"

30 - 70 days

Romaine Lettuce Planting Information:

Romaine lettuce can be grown anywhere as long as you have composted soil. Lettuce grows best if planted indoors and transplanted outdoors in early spring. Lettuce does well in composted soil. It does not do well in clay soil. Make successive plantings. Plant your seeds indoors 3 to 6 weeks before setting them outside. Lettuce will better tolerate heat if plants are well thinned and air can circulate them. Spring planting should occur as soon as the soil can be worked, and fall planting should be done around June or July. Plants grow 2 - 10" tall.

Soil Requirements:

Requires fertile soil in a well-drained location in the garden. Apply mulch, grass clippings, or straw around the base of the plant.

Water Requirements:

Keep soil consistently moist, but not waterlogged. Water well during dry and hot spells. Water in the morning only, on the side of the plants and not directly on the leaves.

Fertilizer Requirements:

Use Slow Release (6 Month) Fertilizer when transplanting outdoors. Apply Miracle-Gro Liquid Fertilizer periodically.

Harvest Tips:

Pick outer leaves of romaine lettuce, or cut the entire head about 1" above the soil. A new head may grow.

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Reimer seeds has over 5,000 quality vegetable, flower, and herb seeds for the home gardener and market growers. We do not sell any Genetically Modified seeds. This year we reduced our prices on many items, added new items, and have added additional bulk items by the ounce and pounds! Take time to review our impressive Online Seed Catalog. Sorry, we do not have a printed catalog to mail you. Plan your garden, and then order your varieties for this upcoming season. Please check back often, as we add new items regularly. If you don’t see an item you want you can always email us and we’ll see if we can bring it into stock!