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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.
Plant spinach seeds 1/2 inch (1.3 cm) deep and 3 inches (7.6 cm) apart in wide rows, and lettuce seeds 1/8th inch (0.3 cm) deep, and 6 inches (15.2 cm) apart. For a continuous harvest, sow every two weeks while cool temperatures allow. This way you will get a staggered harvest that lasts longer.