Landscaping under any tree can be challenging, thanks to the dense shade cast by the branches and the abundance of thick roots in the soil. But black walnut trees (Juglans nigra) seem to be in a ...

The genetic mechanism is similar to sex determination in many animals. Pictured, Groh with a California black walnut tree on the UC Davis campus. (Sasha Bakhter, College of Biological Sciences) The ...

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 ...

Wondering if you can eat a black walnut from a tree in your yard or foraged from the woods? The answer is yes, but first, you ...

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