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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.
1 Lettuce grown this way needs between 15 and 18 hours of light every day. 2  If you are growing your lettuce indoors, you can place the bucket underneath a fluorescent light. 3  Plants that are grown in a hydroponic setting require water and nutrient support just like soil-based plants.