Ruby Slippers Oakleaf Hydrangea (Hydrangea quercifolia 'Ruby Slippers') Ruby Slippers Oakleaf Hydrangea (Hydrangea quercifolia 'Ruby Slippers') is a deciduous flowering shrub noted for its large, conical panicles of creamy white flowers that gradually mature to soft pink. Its oak-shaped foliage offers vibrant and rich red to burgundy hues