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With most trees, it’s best to let fallen leaves remain where they lie, but you can further reduce the concentration of juglone in the soil around a black walnut tree by keeping the area clean.

While producing this substance benefits the black walnut tree by limiting competition, it harms other vegetation, causing yellowed, wilted leaves and ultimately death from being exposed to juglone.

Black walnut grows on the eastern half of the U.S. except the northern border. Black walnut prefers moist well-drained soils, especially along streams and rivers. These trees usually grow scattered in ...

This occurs in both domesticated walnuts and wild relatives, like the Northern California black walnut. In wild species, the ratio of male-first to female-first trees is almost 1:1. Groh and his ...