How many trenches should be excavated around a tree to effectively cut through its root system?

Excavating four trenches around a tree is necessary to effectively cut through its root system. This method allows for an even and comprehensive approach to root removal. By creating four trenches, one can ensure that the majority, if not all, of the significant roots extending in various directions around the tree are targeted. This reduces the risk of the tree being destabilized, which can occur if only a few root segments are severed. Additionally, this approach minimizes the potential stress on the tree, as it allows for better redistribution of nutrients and water uptake from the remaining roots.

Creating fewer trenches might not provide adequate coverage around the tree, resulting in some roots remaining intact, which could cause stress and potential problems for the tree in the long run. Therefore, the choice of four trenches strikes a balance between efficiency and the health of the surrounding landscape.