When to plant lettuce

Timing

Sow leaf or butterhead types as soon as soil can be worked in the spring, or in late summer; crisphead and cos (romaine) types may be transplanted in early spring and fall. Timing on their sheet — not a national calendar.

Timing

Leaf lettuce on their sheet can be grown from March to December with a break in July and August. Geographic calendar on their sheet — not a national plant date.

Start

Their sheet lists 3 to 4 week old transplants. Timing note on their sheet — not a yield promise.

Timing

Sow leaf or butterhead types as soon as soil can be worked in the spring, or in late summer. Timing on their sheet — not a national calendar.

Limit

Maryland lettuce sheet only. Calendar is not a national plant date.

Temperature

Lettuce is a cool-season crop; their sheet lists temperatures of 55 to 65°F. Temperature range on their sheet — not a BioArva climate zone.

Germination

Their sheet lists soil temperature for seed germination of 60 to 80°F, and says raw lettuce seed will not germinate at a soil temperature above 95°F. Germination range on their sheet — not a BioArva climate zone.

Seedling

Lettuce seedlings should be protected from the wind because the young plants are tender. Seedling note on their sheet — not a product SKU.

Temperature

Lettuce is a cool-season crop that prefers temperatures of 55 to 65°F for optimum growth. Temperature range on their sheet — not a BioArva climate zone.

Limit

South Carolina HGIC 1312 only.

Germination

Lettuce can be planted once soil temperatures are above 40°F but tend to germinate best at 55°F to 65°F. Germination range on their sheet — not a BioArva climate zone.

Timing

Their sheet lists planting lettuce at least a month before summer in the context of heat. Timing on their sheet—not a national calendar.

Timing

For fall production, lettuce can be planted in late summer to be harvested in the fall. Timing on their sheet — not a national plant date.

Succession

For an ongoing supply of lettuce greens, do successive plantings 10 to 14 days apart. Succession interval on their sheet — not a BioArva calendar and not a yield promise.

Spacing

Direct plant seeds ¼ to ½ inch deep with rows 12 to 18 inches apart; they typically overplant at 10 seeds per foot and thin seedlings to 4 inches apart. Spacing on their sheet — not a BioArva average.

Limit

This Illinois blog sheet only. Not blended with their gardening lettuce page.

Temperature

Lettuce is a fairly hardy, cool-weather vegetable that thrives when the average daily temperature is between 60 and 70°F. Temperature range on their sheet — not a BioArva climate zone.

Timing

Leaf, Cos and butterhead lettuce can be planted anytime in the spring when the soil is dry enough to rake the surface. Timing on their sheet — not a national calendar.

Water

Watering is essential for seed germination and establishment of seedlings. Water note on their sheet — not a BioArva irrigation schedule.

Limit

Illinois gardening lettuce page. Different URL from their Good Growing blog.

Timing

Plant seeds in the garden as early as 4 to 6 weeks before the average date of last frost. Timing on their sheet — not a national plant date.

Limit

Wisconsin Horticulture salad-greens article only.

Season

Lettuce is a cool-weather crop that does best in spring and fall, but there are cultivars that are more heat tolerant – often labeled as “summer lettuce.” Season note on their sheet — not a cultivar ranking or product.

Sun

Most cultivars do best in full sun but many do well in light shade during the summer. Light note on their sheet — not a site ranking.

Limit

Wisconsin Horticulture lettuce article. Different URL from their salad-greens page.

Timing

Direct seed as soon as the soil is workable in April. Minnesota calendar on their sheet — not a national plant date.

Timing

For a fall crop, sow seed about three months before the average first fall frost date. Timing on their sheet — not a national plant date.

Timing

Start seeds indoors in early April for transplanting in late April and early May. Minnesota calendar on their sheet — not a national plant date.

Limit

Minnesota lettuce sheet only.