I'm sorry, I respectfully disagree with that statement. We have spruce, sugar maples, box elders, silver maples, redbud, sycamore, scarlet maple, Japanese maple, black walnut, catalpa, apples, peaches, nectarines, and nowhere around any of them is the ground bare...and I do NOT use fertilizer or water any of my lawn....why would trees cause the ground to be bare?