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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.
Vegetables that Mature in 90 to 150 Days. Lettuce, spinach, greens and new potatoes reach full maturity at 90 days. Corn, carrots, potatoes and cucumbers are ready for harvesting after 120 to 150 days. Harvest leafy greens with scissors, cutting the leaves gently to obtain multiple harvests. New potatoes are the small first potatoes that develop.