Lettuces are a cold-season crop, which means they fare best in cooler, more temperate conditions. Get on and sow them nice and early—starting two weeks before your last spring frost. You can keep planting until the weather gets hot, and then start again towards fall (planting 6 to 8 weeks before first fall frost). It’s a great leafy green to grow because it grows quickly, produces for a long time, and isn’t very demanding as long as you keep it sufficiently watered. Plus, it grows great in raised beds and containers, making it ideal for small spaces, too.