Black Walnut leaves toxicity

This topic contains 1 reply, has 2 voices, and was last updated by  margaret 1 year, 7 months ago.

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October 16, 2011 at 5:59 pm #17809

sunnyf

We have a large black walnut tree in our yard along with many other trees. We are mulching all of our leaves with a mower this fall and putting them in a bin to use in the garden later. Is this okay to do with the black walnut leaves? I am concerned about poisoning the garden with them, but if we don’t use them for at least 6 months, should it be okay?

October 16, 2011 at 6:13 pm #17810

margaret

Ohio State extension and other sources say it’s ok:

“Walnut leaves can be composted because the toxin breaks down when exposed to air, water and bacteria.”

The full fact sheet on black walnut issues from the allelopathic of the chemicals in its roots, etc:

http://ohioline.osu.edu/hyg-fact/1000/1148.html

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