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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.
Almost any kind of leaf lettuce will grow quickly in a hydroponic system. Some of the types to try include Romaine, bibb and butter crunch, all of which are ready in three to four weeks. Head lettuce, such as iceberg, will grow well, but the heads take about twice as long to be ready as the leafy types. When growing leaf lettuce, harvest just the outer leaves of the plants and leave the inner leaves to grow, to give you a crop you can harvest almost every day.