A spot that gets sun in the morning, but is protected from the worst of the afternoon sun, is ideal. Keep in your fridge vegetable crisper. ENJOY: As part of canapés when entertaining, use as a bread replacement or simply cut and toss into your next salad. Pest problems are easy to deal with, but only climactic conditions can ensure head formation. We cannot help if you are overrun by giant slugs. Summary. Leaf Lettuce. You also have the option to opt-out of these cookies. One of the most commonly grown hydroponic crops, lettuce (Lactuca sativa) matures in a little more than a month. Lettuce is categorized as two types: head (iceberg) and leaf, which includes romaine, butterhead, and leaf types.