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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.
In greenhouse studies, lettuce grown in the short days of January didn't bolt until about 135 days after planting, while those sown in July bolted in only 90 days. Heat may be a factor in bolting, if it occurs when the plants are nearing maturity. Dry conditions may also contribute to it.