It can be tempting to think of a troublesome root the same way you might think of a troublesome branch: identify it, cut it, and move on. But roots on a living tree play a different role than branches, and removing them calls for a more careful approach.
Roots serve two essential functions for a living tree. They anchor the tree in the ground, providing the physical stability that keeps it upright, and they absorb the water and nutrients the tree needs to survive. Removing or damaging a significant portion of the root system can affect both of these functions simultaneously, which is different from removing a branch that primarily affects the tree’s appearance or a specific area of growth.
The impact of cutting a root depends on several factors, including the root’s size, its distance from the trunk, how much of the overall root system would be affected, and the tree’s current health and species. A smaller root farther from the trunk generally carries different implications than a larger root closer to the base, though there is no universal size, distance, or percentage that determines what’s safe to cut in every situation. Each tree and each root need to be evaluated individually.
This is part of why removing roots from a living tree is not something to approach the same way as clearing residual roots after a tree has already been removed. With a living tree, the goal is to address the specific concern, whether that’s interference with a structure or hardscape, while minimizing the impact on the tree’s ongoing health and stability. That balance requires professional judgment rather than a simple rule of thumb.
If a tree’s roots are creating a problem you’d like addressed, having the situation evaluated first helps ensure any root work is appropriate for that specific tree. This guide to tree root removal services explains how root-related concerns are typically assessed and approached.