Growing your own nut trees in the backyard is rewarding in so many ways. Not only do nut trees produce nuts for snacking, but they can also enhance the landscape and provide shade. When selecting nut trees to buy, first find ones that are suitable for your hardiness zone. Next, consider their mature height and spread. While some nut trees, like the Hardy Almond, may grow 15-18 ft. tall, others can grow 40 ft. or taller. Other considerations when choosing nut trees for sale are their growth rate, habit or shape, sunlight requirements, pollination requirements and what types of nuts they produce.