Lettuce is a long-day plant, meaning it will start flowering (bolting) when the hours of darkness decrease. If you try to grow a lettuce plant indoors to full maturity, it may start to flower when the grow light is on for 16 hours each day. But this shouldn’t be a problem, if you harvest the leaves with scissors when plants are 6 to 8 inches tall. These baby lettuce plants will re-grow, giving you a second and possibly third harvest! This is called “cut and come again” harvesting. Place the lights just a few inches above the lettuce plants to keep them stocky. Bottom watering is a good practice.
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