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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 Mixes. Johnny's offers mixes of lettuces balanced for color, texture, flavor, and uniform maturity. Our lettuce mixes can be harvested at 3â6 weeks for use on their own in or in combination with other salad mix ingredients. Sow every two weeks for a continuous supply.