Joy Creek Nursery (www.joycreek.com) say: We have grown this for so many years that we have lost track of its provenance. All that remains is the name. Half-foot panicles of white grace this large shrub with individual florets arranged in an open fashion. The large, oak-leaf shaped leaves measure 6 1/4 inches long and wide. As the cooler weather arrives, the leaves of Hydrangea q. `Snow Cloud’ turn red purple along their margins.