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The leaves become bitter and the plants begin to bolt as the stem elongates into a tall bloom stalk. Leaf lettuce varieties take about 40 days from seeding to harvest while head types may take 70 days. This is another reason the head types are more of a challenge. To get more from your garden space, consider interplanting your lettuce with slower maturing crops.
Sow lettuce seeds in average soil in full sun in early spring for first crop. Sow in late summer for fall crop. Sow every two weeks to extend harvests. In late summer, sow in a protected are that stays below 75 degrees F. Sow thinly in rows 12 inches apart and cover with Â¼ inch of fine soil.