Buckthorn Rhamnus

Buckthorn is a genus of over 140 species of relatively small, perennial, evergreen or deciduous trees or shrubs in the buckthorn family. The species range in height from 3 to 33 feet tall. The common name comes from the plant's thorn-tipped branches.The plant is native to most of the northern hemisphere and typically found in forests or natural areas in rich woods. R. Caroliniana is the species native to North Carolina. Not suprisingly, the genus name comes from the Greek name for spiny shrubs.

Buckthorn is a hardy plant that does well in average, medium moisture, well-drained soils in full sun to part shade. It prefers consistent moisture and adapts to a variety of soils and environments.

Buckthorn has been used for ornamental purposes including hedges, privacy screens, and windbreaks. However, one species of buckthorn (R. cathartica) is considered invasive in many areas of eastern North America. It can colonize and spread rapidly by self-seeding creating a dense understory of new seedlings the following year. It is very difficult to eradicate once established and should be avoided.

Some species of buckthorn are poisonous. R. cathartica is mildly poisonous, R. alaternus can be toxic if consumed in excess, and R. californica is mildly toxic.

Diseases, Insect Pests, and Other Plant Problems:

Susceptible to leaf spots, rust, powdery mildew, aphids, and scales. It is sometimes prohibited in areas where oats are grown because it is an alternate host to crown rust disease.