Michigan State University Extension
Ornamental Plants plus Version 3.0 - 00000798
11/12/99
Juglans nigra--Black Walnut
Hardiness Zones: 4 to 9
Height: 75 ft Spread: 65 ft Form: rounded
Type: deciduous tree
Annual Growth Rate: 12 to 18 inches
Comments: Black Walnut grows best in a sunny open location
and a moist rich soil. The tree grows rapidly when young
but slows down with age. While valued as a lumber tree it
may not make the best yard tree. The nuts are edible but
are a mess to clean up. The husk (Vis. 1) covering the nuts
can stain hands and pavement. Black walnut roots contain
juglone which kills the roots of other plants when the
roots touch. Plants such as tomato and evergreens are
quite sensitive to juglone.
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This file was generated from data base ZZ on 01/19/00.
Data base ZZ was last revised on 11/12/99.
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