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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.
Many varieties of looseleaf lettuce can be harvested numerous times during a single growing season after being cut approximately 1 above the ground. Some other general guidelines when collecting the entire plant: Leaf lettuce can be cut as soon as it is large enough to use, usually in 50 to 60 days from planting. Cutting every other plant at the ground will give remaining plants more space for growth. Romaine and Butterhead lettuce can be harvested in about 60 to 70 days from planting.