Dioscorea opposita Chinese Yam (Shan Yao)
A twining, perennial climber with attractive, heart-shaped foliage and small, white, autumn flowers that is native to China. The plant’s tuber is used in Chinese herbalism. Produces tubercles in the leaf axils. Hardy to -18C. Height 3 m. Humus rich, well-drained, moisture retentive soil in sun to light shade.