Source of Toxicity Black walnuts produce a chemical called juglone, which occurs naturally in all parts of the tree, especially in the buds, nut hulls, and roots. The leaves and stems contain smaller quantities of juglone, which is leached into the soil after they fall.

Can black walnuts be poisonous?

An unpleasant toxic surprise Black walnut trees produce a toxic chemical called juglone, a chemical so strong it can damage and even kill off vegetative growth around these trees and is blamed for issues in horses who are exposed to black walnut shavings.

What part of black walnut is toxic to dogs?

Black Walnuts and Dogs According to Colorado State University, fallen walnuts and their hulls may develop mold that contains Penitrem A, a mycotoxin.

Are walnut hulls poisonous?

Pollen shedding from walnut trees can cause allergic reactions in people and horses. Husks of fallen walnuts can become toxic to livestock, and lethal to dogs if ingested due to a mycotoxin called 'Penitrim A', which is produced by Penicillium mould.

What part of black walnut is medicinal?

The kernel is the part of the walnut that's commonly eaten raw or roasted and can be pressed for oil. The hulls contain antioxidants and are used in extracts and supplements for medicinal purposes, such as to treat parasitic infections or decrease inflammation ( 1 ).

What do you do with Black Walnut hulls?

People use the outer covering of the nut (the hull) to make medicine. Black walnut is used to treat parasitic worm infections and certain other infections including diphtheria and syphilis. It is also used for leukemia.

Is Black Walnut mulch toxic?

Black walnut (scientific name Juglans nigra) produces the chemical juglone, which is toxic to many other plants. Juglone does not travel far, so toxicity is limited to about 50 feet from the outer perimeter of the tree crown. Black walnut shells, bark and wood chips should not be used as mulch or compost.

Are black walnut leaves edible?

What is this? Walnut leaves can be used in teas, tinctures, hair rinses and yes, they can even be composted. All things considered, you'll often want to be using the leaves of English walnuts (Juglans regia) rather than those of black walnuts (Juglans nigra) for most of the ways listed below.