Juglans nigra

Black Walnut

Juglans nigra

Black Walnut

The Black Walnut tree is Native from New England all the way down the east coast and over to Texas. It is a tall deciduous tree reaching heights of up to 75 feet. It is prized for its timber and has an elegant grain with a very hard yet workable texture making it perfect for furniture making, floors and other fine carpentry including its use to fabricate gunstock. A 50-foot tree can be valued at up to $2500 for its wood. The nuts provide a robust, distinctive, natural flavor and crunch as a food ingredient. Members of this family of trees produce a chemical called juglone, which is an example of an allelopathic compound, a substance that is synthesized by one type of plant and affects the growth of another. Landscapers have long known that gardening underneath or near Black Walnut trees can be difficult. Ancient Greeks and Romans called black walnut fruit the "imperial nut" and reportedly used the hull to treat intestinal ailments. Black Walnut has also played a part in Russia since the seventeenth century. Throughout history, every part of the tree has been used in folk extracts or products to treat dozens of conditions, including the bite of a mad dog.

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Traditional Health Benefits of Black Walnut

Digestive Support, Beauty & Radiance Support

What is Black Walnut Used for?

The fresh green hulls are used to produce the herbal products and are concentrated in the chemical mentioned above; juglone. Many cultures have used Black Walnut hulls to support a healthy intestinal environment and eaten the nuts for their rich Omega 3 essential fatty acid content, vitamin C and flavor. The astringency from the tannins in the hulls and leaves have led herbalists over the years to include Black Walnut in topical applications for the skin.

View Important Precautions

Active Constituents of Black Walnut

Juglone (5-hydroxynaphthoquinone), iodine

Parts Used

Fresh green hulls

Additional Resources

Feldman EB. J Nutr. 2002;132:1062S-1101S. McGuffin M, ed. American Herbal Products Association’s Botanical Safety Handbook. Boca Raton, FL: CRC Press; 1997.

Important Precautions

Not for use during pregnancy or lactation. If you have a medical condition or take pharmaceutical drugs please consult your doctor prior to use. Not for long term use- maximum time of use 6 weeks or as recommended by a practitioner.


This information in our Herbal Reference Guide is intended only as a general reference for further exploration, and is not a replacement for professional health advice. This content does not provide dosage information, format recommendations, toxicity levels, or possible interactions with prescription drugs. Accordingly, this information should be used only under the direct supervision of a qualified health practitioner such as a naturopathic physician.

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