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13 Black Walnut

(Juglans nigra )

This native of eastern U.S. forests has adapted well in Colorado’s irrigated semi-arid regions. Squirrels enjoy feeding on black walnuts, and the tree’s dark brown heartwood commands a high price. As a shade tree, its fruit litter is problematic, and the tree’s roots produce “juglone,” a toxic substance that prevents the growth of other plants.