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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.
Lettuce is a cool-season crop that grows well in the spring and in the fall in most regions. Lettuce seedlings will even tolerate a light frost. Temperatures between 45 F and 65 F are ideal. Garden lettuce is far superior, in both taste and vitamin A content, to supermarket brands. Because lettuce grows quickly, the best approach is to plant a small amount at a time, staggering your plantings. Find more tips for planting delicious lettuce here.