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 also. A tremendous advantage of the Oakleaf is that it can thrive in much dryer locations.The Oakleaf hydrangeas thrive with very little attention. The Oakleaf gets its name from the shape of its beautiful large leaves. These leaves often turn colors of brilliant red, orange, yellow and burgundy in the fall if planted in a sunny location with a little afternoon shade. The Oakleaf hydrangea can tolerate and even thrive in much sunnier areas than other Hydrangeas.It is a multi-stemmed, deciduous shrub that typically grows 4-6' tall and 4-5' wide. It is noted for producing pyramidal panicles of white flowers in summer on exfoliating branches clad with large, 3-7 lobed, oak-like, dark green leaves.