Nut trees are a smart choice for many gardeners and homeowners. Not only do nut trees produce flavorful nuts for snacking and making into recipes, the trees add beauty and shade to the yard. When selecting the best nut trees to buy online, consider your hardiness zone. Next, take into account the tree's mature height and spread. Depending on the variety, some nut trees are smaller and suitable for smaller yards and landscapes, while others grow quite large. Most nut trees grow best in full sun, or six or more hours of direct sunlight daily. Other factors to consider are the tree's growth rate, habit or shape, pollination requirements, and the types of nuts it produces.