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 ...

Some companies claim to sell black walnut tree clones developed at Purdue University; however, Purdue University no longer holds patent rights to these trees and cannot endorse the claims made for 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.