Leaf lettuce doesn't form a head at all - it grows up and out. It's very easy to plant and will grow anywhere, almost anytime. Make regular plantings every few weeks over the entire season, starting as soon as you can work the soil in the spring. That way you always have lettuce that is young and fresh. Never give the crop time to get old, tough and bitter - harvest at the peak of freshness and taste. Harvest leaf lettuces by picking off the large outer leaves or cutting plant off an inch above the ground and letting it grow back. 'Black-Seeded Simpson' is an old favorite, and one of the earliest leaf lettuces you can grow. 'Simpson Elite' is a new improved version. 'Oak Leaf' has thin, tender leaves and takes heat well; 'Red Salad Bowl' is a red-tinged oakleaf. 'Green Ice' has crinkly leaves and is one of the slowest to go to seed. Be sure to include some 'Red Sails' or 'Four Seasons' lettuce, too. They add great color and taste to a salad, and looks beautiful in the garden.