Planting Under Elm Tree - Knowledgebase Question

Mt. Vernon, MO
Question by ktmm
March 2, 1998
I have a beautiful, very old (100+ years) elm tree in my backyard and wish to plant a shade garden underneath. How can I improve the soil without disturbing the elm's feeder roots too much or hurting the tree in any other way?


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Answer from NGA
March 2, 1998

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Since elms do have quite shallow roots, I wouldn't want to take a chance on disturbing them by planting underneath. If you brought in soil for your new bed, the elm roots would suffer from the soil compaction and reduced oxygen supply caused by the new plantings on top. If your tree became stressed, it would also then be more susceptible to insects and disease. I've tried to plant under shallow-rooted trees and have given up because neither the tree nor the plants underneath were happy with the situation.

If you want to dress up the area under the tree, you could spread some cocoa hull mulch (which also smells wonderful).

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