Also known as Juglans nigra, Eastern Black Walnut and American Walnut.
The black walnut is a large, moderately growing, majestic tree, which reaches 60 – 75 feet at maturity. It is native to the United States, and prefers clay or loam soils. It has very large, upright spreading, open branches with dark green leaves, and loses its lower branches toward maturity.
The Black Walnut has been a dependable producer of extra large crops for many years. The nuts are large and plump, and crack out of the shell easily. The roots of the black walnut produce a substance known as juglone (5-hydroxy-alpha-napthaquinone), which is toxic to many plants.
The fruit, leaves and bark of the Black Walnut tree offer many benefits. Taken internally, Black Walnut helps relieve constipation, and is also useful against fungal and parasitic infections. It may also help eliminate warts, which are troublesome growths caused by viruses. Rubbed on the skin, Black Walnut extract is reputed to be beneficial for eczema, herpes, psoriasis, and skin parasites. External applications have been known to kill ringworm, and the Chinese use it to kill tapeworm with much success.
The high tannin content is primarily responsible for its anthelmintic property, although other constituents such as juglandin, juglone and juglandic acid may also be involved. It is known that Black Walnut oxygenates the blood to kill parasites. The brown stain found in the green husk contains organic iodine, which has antiseptic and healing properties.
Black Walnut has the ability to fight against fungal infections, and has antiseptic properties which help fight bacterial infection. It also helps promote bowel regularity.