The canopy is round in shape and expansive, spreading about 50 to 75 feet wide. As deciduous trees, they lose their leaves in wintertime. When in leaf, however, black walnut trees can easily be ...

Black walnut trees produce a chemical called juglone as ... Plants within the dripline or the edge of the canopy will be most susceptible to juglone. However, the toxic zone around a mature ...

The bark has long, strong running ridges and in older trees can resemble alligator hide. Under the surface of the bark is a dark, chocolate brown color. Black walnut trees produce nuts, which are ...