Lettuce One of the vegetable garden's most versatile plants, lettuce comes in an amazing array of colors, shapes, and tastes. Plant a few seeds every week and you'll have a constant crop for fresh salads. Here's a hint: Planting lettuce in a shady spot in the summer months keeps the plant cool, so you can harvest into the hot months. Standout Variety: 'Red Sails', an award-winning variety with reddish-bronze leaves. It's ready for harvest in 45 days.