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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.
If you love salads, lettuce and greens are a great vegetable to grow. They do great in pots or in ga... (For details on growing many other vegetables and fruits, visit our Crop at a Glance collection page .). From baby leaf lettuce to big, crisp heads, growing lettuce is easy in spring and fall, when the soil is cool.Leaf color and texture vary with variety. All types of lettuce grow best when the soil is kept constantly moist, and outside temperatures range between 45 and 75 degrees Fahrenheit.ettuce seeds typically sprout in two to eight days when soil temperatures range between 55 and 75 degrees. In fall, sow all types of lettuce at two-week intervals starting eight weeks before your first fall frost.