What defines the dripline of a tree or shrub?

The dripline of a tree or shrub is defined as the farthest extent of a canopy. This means it corresponds to the outer edge of the foliage where rainwater drips off the leaves to the ground. The dripline is an important concept because it represents the area where a tree or shrub can best absorb moisture and nutrients from rainfall and also where root growth is typically most active.

Understanding the dripline has practical implications in landscaping and gardening, as it helps determine where to apply water, fertilizers, and other treatments for optimal plant health. It also highlights the relationship between the aboveground canopy and belowground root structure, guiding appropriate maintenance practices.