Can I Cut a Tree Root Without Killing the Tree? If you think your tree's roots will cause problems, here's how to cut them without killing the tree. When can you cut a tree root?
Most trees have four to seven major anchoring roots that flare out horizontally from the trunk, with only a couple of deep tap roots. Cutting even one of those roots can remove up to 25% of the root system of the tree and seriously compromise its stability. Only a professional arborist should cut those large roots when absolutely necessary.
If you have a small tree whose major anchoring roots look like they might cause problems later, you might be able to cut those yourself.
If in doubt, get a better look at the root to be sure you need to cut it: Carefully scrape the soil away or wash it out with a high-pressure stream of water. And always make a clean cut with a pruning saw, loppers or pruners to prevent disease or pest infestations.
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