" Few arborists would suggest planting trees on a three-foot center, but if we planted our trees in groups of three or more on ten-foot centers, the resulting root matrix would keep them locked in place through thick and thin. None of the trees would develop into a single majestic specimen tree, but together they would form a single grove of trees that the eye will take in just as if they were one large tree. "

― Douglas W. Tallamy , Nature's Best Hope: A New Approach to Conservation That Starts in Your Yard