Despite what you might think, this, the true species is extremely rare in cultivation. Collected originally in N. Vietnam on Tay Con Linh, this Asian Hydrangea relative, like many of its cousins, has flowers which are very blue on acid soils, and pink on alkaline. Diffuse heads of thick petalled flowers produced in late summer/autumn, followed by intense-blue berries. An evergreen shrub to 3m high for mild areas.