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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.
Romaine lettuce is ready to harvest in 65-70 days. Baby Romaine is ready in about 55-60 days. Like other lettuces, Romaine lettuce seeds are very fine. Plant in rows, spreading the seeds as thinly as possible. No matter how hard you try, the seeds are very difficult to disperse.