The bark, woods, nuts, and roots of J. nigra contain juglone, a compound which is toxic to horses. Horses are primarily effected by exposure to shavings containing parts of the black walnut tree. Horses can also be poisoned from ingestion of the bark, pollen, or fallen leaves.Click to see full answer. Similarly, you may ask, are black walnut leaves toxic to horses?Toxic Plant Profile: Black Walnut. Black walnut trees are considered toxic but are unique from most other toxic plants. They are safe to all livestock except horses, and horses are generally only affected by shavings made from the tree.Likewise, are walnuts bad for horses? When ingested, black walnuts can cause laminitis and colic. A particular mold found within the husk of the nut can cause liver cancer. Due to the highly toxic nature of the tree and its nuts, caregivers may choose to keep their horses safe by pasturing them a good distance from black walnut trees. Similarly one may ask, can black walnut kill horses? Black Walnut (Juglans nigra) Shavings with as little as 20% black walnut content are toxic to your horse. The effects of Black Walnut poisoning happen incredibly quickly, usually within 24 hours after your horse has been exposed. Cooling their legs and hooves with a hose can help make your horse more comfortable.Is Black Walnut harmful to humans?Black walnut trees (Juglans nigra) are native the United States and are found in U.S. Department of Agriculture plant hardiness zones 5 through 9. The tree is not considered toxic to humans, and generally will not harm anyone who is not allergic to tree nuts or walnuts specifically.

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