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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.
Growing Lettuce in the Home Garden. Lettuce is generally a cool season crop. If forced to grow in warm weather conditions the plants will quickly send up a seed stalk and develop a bitter flavor, definitely not what the home gardener is interested in. Plant lettuce directly in the garden as soon as the soil can be worked, or better yet start seedlings indoors to be transplanted into the garden.