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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.
LETTUCE. The common lettuce of the garden (Lactuca sativa crispa) is a tall, leafy, annual herb with a milky juice. At first the stem is very short and the foliage densely clustered near the ground, but later in the season a flower stalk, 2 to 4 feet high, appears.arly Growth. --Root development in lettuce takes place rapidly. When conditions for growth are very favorable, lateral branches begin to appear on the first 1 to 1.5 inches of taproot only 6 days after the seed is planted and when the cotyledons alone have unfolded.