How to Grow a Black Walnut Tree (Juglans nigra):
Plant your Black Walnut seedling in full sun with well-drained, deep soil (preferably loamy). Choose a spot with at least 40–60 feet of space from buildings or other trees — black walnuts release juglone, a natural compound that can inhibit growth of nearby plants. Water regularly during the first year to establish roots, then reduce once the tree is established. This hardy tree grows well in USDA zones 4–9 and can live for over 100 years, producing valuable nuts and timber.
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