Drip lines...

The drip line of a tree is defined as where water would roll off the outer edges of the limbs. In theory, the root mass of a tree is approximately the width or diameter of that drip line. Trees and turfgrass compete for nutrients and moisture from the soil and sunlight from the sky.

The only wilted spot on the 12th fairway is under the tree's drip line at about 200 yards out. This picture helps validate the fact that trees and turf are in competition with each other.