Walnut trees (carya illinoinensis) take 20 to 25 years to reach full maturity and reach 60 to 100 feet tall, with an extension of 30 to 50 feet wide. 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. 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.
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