The Oakleaf hydrangea is one of the few hydrangeas native to the United States (H. arborescens being the only other native of which I am aware). The Oakleaf hydrangea is a dramatic, white-blooming shrub with four seasons of interest. It blooms best in areas where summers are somewhat hot, but it is winter hardy farther north than the macrophylla (mophead). A tremendous advantage of the Oakleaf is that it can thrive in much dryer locations than its cousins. Mopheads struggle in my sandy soil, but the Oakleaf hydrangeas thrive with very little attention.