We have recently discovered that we have at least 2 walnut trees in our yard,...

Asked June 16, 2015, 4:45 PM EDT

We have recently discovered that we have at least 2 walnut trees in our yard, and they seem to be killing a lot of other shrubs and plants. I think we need to call a tree service and cut them down, but how do we make sure there aren't more trees growing, and will that take care of the poisoning of our soil? Is the toxin coming from the roots or overhead? Who should we ask to help us remove them, that will know what to do?

St. Louis County Minnesota black walnut tree

1 Response

Hi, and thanks for contacting Aae!

Removing these trees is certainly the first step, but you should know that Juglone - the chemical that is the problem with Black Walnuts - will continue to cause those problems unless all the roots can be removed.

Here is some good information about this tree, and a list of plants that will be able to tolerate the juglone:
https://www.extension.purdue.edu/extmedia/ho/ho-193.pdf