Black walnut trees begin nut production at approximately 10 years old. The best nut production occurs after the tree ages past 30 years. Production increases with more sunlight, but can be sporadic. Expect good nut production in 2 of every 5 years the tree produces.
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Kitten Arbuckle is a freelance writer living in Indiana. Arbuckle has been writing for websites such as Garden Guides since early 2009. Her education includes training in landscaping, certification in herbal medicine from a botanical sanctuary and a variety of college courses.