A single nut tree can produce plenty of nuts for home use. Cross-pollination (pollination between two or more varieties) will increase production slightly, but it is not absolutely necessary in most cases. For pollination, walnut pollen is carried by the wind to receptive flowers. Your land is the food your walnut tree uses to feed itself and eventually produce delicious nuts.
Fertile soil will give you the best chance of getting a successful harvest. Georgia pecan trees will generally require at least one fertilizer treatment each year to stay healthy. A notable fact about the walnut tree is that the pecan nut is botanically classified as a drupe, which is a type of fruit. So when a nut tree “produces (or bears) fruit, it actually produces the nuts that we commonly call walnuts.
If you already have pecan trees, you may notice small seedlings growing around them from fallen walnuts that germinate. However, if you're planting pecan trees to grow an annual nut crop, not only is it important that you have lots of land, but it will also require multiple fertilizer and insect control applications each year and you may only get a bountiful nut harvest once every three years. If you decide to grow nut trees from seed, use fresh walnuts harvested in the fall from a local source to ensure that your choice suits your climate.