Small to medium-sized tree up to 5 m, with attractive, coarsely textured grey-green foliage. The bark is corky and deeply longitudinally fissured. The small, green flowers are borne in dense finger-like structures in spring-summer and they are pollinated by insects. The flowers are followed by the production of small, purple-black berries, which are relished by many species of fruit-eating birds. It requires well-drained soil and a warm garden as it is frost tender. It can tolerate more water in the garden than what it gets in the wild and makes a lovely garden subject. It attracts birds. Named for Pierre Cusson 1727-1783 who was a French Jesuit, mathematician, physician, professor and botanist who traveled extensively and wrote many publications.