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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 seedlings need 14 to 16 hours of bright light in order to grow full, bushy leaves. 5. Invest in a fluorescent grow light. If you cannot provide the lettuce seedlings with enough natural light, place the container 4 inches (10 centimeters) beneath a grow light and keep the seedlings there for 14 hours.