University of Florida

Plant Identification Learning Module:
Fruits & Nuts

Black Walnut (Juglans nigra)

Black walnuts develop in clusters inside a rough, green husk about the size of a tennis ball. The shell of the nut is nearly round, black, very hard, rough and deeply ridged. The nut (kernel) is contained inside the shell. Leaves are 12 to 24 inches, alternate, and pinnately compound, having 15 or more lanceolate leaflets with serrate margins. Black walnut trees are very large, ranging from 50 to 75 feet in height and width and grow and fruit in north Florida.