If your's isn't ready already, then soon it will be time to harvest lettuce. The very first time I planted lettuce, I thought pulling the entire plant was the way it was harvested. Don't make the same mistake I did. Grab a pair of scissors and snip your lettuce leaves about 1 inch above the ground. It is a quick, easy and clean way to harvest. More lettuce leaves will grow up from the little chopped plants.