What is the correct tree protection zone for a mature tree with moderate tolerance to disturbance?

The correct tree protection zone for a mature tree with moderate tolerance to disturbance is established at two feet per inch of diameter at breast height (DBH). This recommendation is based on the understanding that a tree’s root system plays a critical role in its overall health and stability. The root zone typically extends beyond the tree's drip line, and a larger buffer is necessary to minimize the risk of damage from construction activities, soil compaction, and alterations to water and nutrient availability.

Establishing the protection zone at two feet per inch of DBH helps ensure that the tree has sufficient space for its roots to access water, nutrients, and maintain the canopy's health. This approach takes into account the tree's specific tolerance to disturbances; while it is moderately tolerant, it still needs considerable protection to safeguard its long-term vitality.

Using a less extensive zone, like six inches or one foot per inch of DBH, would not provide the necessary buffer to adequately protect the tree from harmful impacts. In contrast, three feet per inch of DBH could be considered too conservative for a tree with moderate tolerance, potentially limiting land use or construction unnecessarily without sufficient justification. Thus, the two feet per inch recommendation strikes an appropriate balance for protection and practicality.