The Climbing hydrangea (Hydrangea petiolaris) belongs to Hydrangeaceae (the Hydrangea family). It is a deciduous woody vine that is native throughout Japan, as well as Sakhalin and the Korean Peninsula. This vine grows in mountain and climbs up adjacent trees or rocks by the aerial roots. The leaves are broad ovate, elliptic or oblong and alternate with acute toothed edges. The umbels are borne on the terminal branchlets, and bloom white flowers in June to July. The ornamental flowers have 3-4 sepals that look like petals.