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150 year old black walnut tree #411932 - Ask Extension

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150 year old black walnut tree #411932

Asked July 05, 2017, 2:32 PM EDT

I have approx 150 year old black walnut tree.  While trimming, I noticed that the main crotch of the tree has some debris that appear to have rotted causing a spot that looks like top soil.  I read that I should remove all the debris and use some sort of cement to keep water out.  What is the best way to preserve this tree? I don't want to loose it.

Genesee County Michigan

Expert Response

To fill a cavity on any tree with concrete will not help the tree. Here are some reasons and hopefully websites to help you through this issue. 1. Cement does not bond with wood. 2. Black walnut is a strong fibered wood capable of resisting many rot situations. 3. Cement holds water which will hasten the spread of decayin the wood 4. The rigidity of the cement would cause the flexible nature of the tree to become further injured by its own mechanism. 5. Causes interference with the natural compartmentalizations of decay (CONDIT). There are many articles on the net dealing with CONDIT. Look for them. Try these resource: http://themotonarboretum>horticulture-care. Check with a certifiedArborist from your Yellow Pages
Jim Harrow Replied July 05, 2017, 7:50 PM EDT
Thank you!
The Question Asker Replied July 05, 2017, 8:21 PM EDT

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