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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.
When the smaller leaves get big enough, harvest those. You may be able to come back to a plant two, three or four times, a few days apart, before it gives up in the summer heat. To prolong the lettuce harvest, look for bolt-resistant varieties and sow seeds several times at two-week intervals.