Once leaves fall off the branches, the scar left behind on the stem is shamrock-shaped. Search for black walnut trees by the color of their bark—varying from pale, grayish brown to deep ...

The field guide helps identify common Indiana woodlot trees. Each week ... Under the surface of the bark is a dark, chocolate brown color. Black walnut trees produce nuts, which are ridged and rounded ...

Black walnut trees produce a chemical called juglone ... the roots and is also found in smaller concentrations in the leaves, bark, wood, and nut hulls. While other types of trees also produce ...