The trees will begin to produce some nuts three or four years after planting. Significant production can be achieved in six or eight years. Good production will begin in the ninth or tenth year. Trees can be productive for 100 years or more.
Walnuts have particular pollination, nutrient and pest management requirements if they are to produce abundant crops. Remember that many nut cultivars don't start producing nuts until they are between 12 and 15 years old. 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. 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. Many people ask us how long it takes for a walnut tree to produce quality nuts and how to increase the production of pecan nuts per tree. If you already have pecan trees, you may notice small seedlings growing around them from fallen walnuts that germinate. The most important disease in walnut trees is nut scab, especially on older trees that cannot naturally resist disease mutations.