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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.
On Oct 28, 2004, smiln32 from Oklahoma City, OK (Zone 7a) wrote: Leaf lettuce variety - Leaf Lettuce varieties are the easiest and most reliable to grow. Sow seeds in early spring and again after the very hot days of summer are over. In cooler climates, you can make 2 to 3 spring plantings, timed 2 weeks apart. To harvest, pull the whole plant or just snap off the outer leaves.