Wood: The bark of a western species, the cascara buckthorn (R. purshiana), is an important source of laxative chemicals.
Wildlife: Although the black fruits are a strong laxative and cause nausea in humans, they are eaten by birds. Bees and flies feed on the flower nectar.
Horticulture: The common buckthorn transplants easily, is adapted to harsh urban conditions, and responds well to pruning. This species is used as a hedge plant, for screening and as a background plant in difficult conditions. Although it is a tough, adaptable tree useful for planting in areas where few others will survive, this tree must be planted only after careful consideration, as it spreads rapidly by seed to areas where it is often not wanted.
