James A. Duke. Handbook of Energy Crops. Uses Black walnut is one of most valuable natural forest trees in the United States. The nuts furnish a food product, used mainly for flavoring baked goods, pastries, and confectioneries.
Wood is also easy to work, resistant to destructive fungi and insect pests.
Woody shells on fruits used to make jewelry. Green fruit husks boiled to provide a yellow dye. Trees used for shade and ornamentals. The bark and leaves are considered alterative, astringent, detergent, laxative, and purgative. They are used for eczema, herpes, indolent ulcers, scrofula.