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

Wet, clay ground and thriving. Late last summer, I noticed the leaves were dead suddenly, and the bark on the trunk was completely loose and falling off. No other trees or shrubs within 50 feet (black ...

Similar to black walnut, the roots of butternut trees release a chemical known as juglone ... black exudate stain that can be easily seen against butternut’s ashy grey bark.