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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.
Two days later (which was five days after sitting the stems in water) I cut my first salad! Leaves were crisp, tasty and fresh. Three days after placing romaine, red leaf and Bibb lettuce stems in water, there was vigorous growth. The stems started growing more leaves after the first shearing. I used kitchen scissors to harvest, because the cuts were clean, with little damage.