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The Daily Insight

How long after removing a black walnut tree is the poison out of the soil?

Author

William Smith

Published May 27, 2026

How long after removing a black walnut tree is the poison out of the soil?

Walnut leaves can be composted because the juglone toxin breaks down when exposed to air, water and bacteria. The toxic effect can be degraded in two to four weeks. In the soil, breakdown may take up to two months after the living walnut tree has been removed.

How do you kill black walnut trees?

Remove the tree by cutting through the trunk about 6 to 12 inches above ground with a chainsaw. You may be able to remove it with an axe if the tree is smaller than 6 inches in diameter. For larger trees, you may need a chainsaw.

How much is a standing black walnut tree worth?

Black walnut logs bring premium prices, and have since the 1700s, with single trees bringing up to $20,000. Bruce Thompson, author of “Black Walnut For Profit,” estimates a mature stand of black walnut trees can bring about $100,000 per acre in timber value alone.

Is black walnut toxic to humans?

The fruit, leaves and roots of black walnut trees contain a chemical, juglone, that can injure other plants. Ingesting even a small amount of pure juglone can cause a serious poisoning effect in humans. Over time, juglone naturally leaks out of walnut roots, leaves and buds into the soil.

Is Black Walnut poisonous to humans?

What’s the best way to kill a black walnut tree?

You have several options at your disposal should you need to kill a black walnut tree. Remove the black walnut tree manually by uprooting it. This method is ideal for small seedlings and saplings. Grasp the tree around its base with gloved hands and pull upward.

How big is the black walnut tree in my yard?

The tree is very large, and in the back yard of a house with no easy access (narrow side yards, no back yard access to street), and overhangs three or four lots and at least 1 house. We are planning on getting a second opinion from another arborist before doing anything.

What’s the best way to remove black walnut hulls?

Take off individual hulls with the plywood method. The hulls of black walnuts are difficult to remove. If you only need to hull a few nuts at a time, try using a hammer to force the nuts through a hole in a piece of heavy plywood. Drill a hole that is 1.75 inches (4.4 cm) in diameter in the board.

Where can I Sell my black walnuts for money?

Most hulling stations are owned by a parent company that will purchase nuts from local harvesters. Harvesting nuts and selling them to hulling stations is a good way to earn a side income if there are lots of black walnut trees in your area.

Is black walnut mulch harmful?

Black walnut pollen (usually in May) has caused allergic reactions in humans and horses and black walnut bedding in horse stalls has a similar effect. However, mulch made from walnut bark is said to be safe to use on even juglone-sensitive plants after composting 6 months to a year.

Is black walnut wood valuable?

Black walnut trees are highly prized for their dark-colored heartwood. They are heavy and strong, yet easily split and worked. Black walnut tree wood is valued for the absolutely wonderful cabinet wood it produces it has been used for gun stocks, furniture, flooring, paddles, coffins, and a variety…

Is black walnut poisonous?

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.

Is walnut tree toxic?

Walnuts, which includes the butternut tree, aka the white walnut, release a substance called juglone from their roots, which is toxic to many other trees and plants. Juglone is also found in the leaves, branches and nut hulls, and horses standing in wood shavings made from walnut trees can develop laminitis, a serious and sometimes fatal hoof