The "Euphorbia tirucalli" or the "Pencil Cactus" is a member of the Euphorbia group of succulents.

Another name for the plant is Milkbush because of the milky sap it discharges when harmed. 

Highly ornamental, the Pencil Cactus will grow in a columnar upright fashion from 8 to 30 ft tall outdoors in a frost-free environment. It has pencil-thin stems that turn a fire-red colour during the colder months.

It is a fabulous houseplant and makes an intricate silhouette in any space.