A Pencil Cactus Plant, Euphorbia tirucalli, is not a cactus plant at all but rather a member of the Euphorbia family, like a Poinsettia. This unique looking plant, native to Africa and India, is also referred to as Indian Tree Spurge, Naked Lady Plant, Aveloz, Milk Bush Plant, and Petroleum Plant. The green succulent stems of a Pencil Cactus, which are about the width of a pencil, branch upwards in an almost geometrical pattern. This is a very different looking plant that I wouldn’t call beautiful and lush, but it is quite a conversation piece. A Pencil Cactus Plant grows quickly and can reach a height of 10ft-15ft. outdoors and up to 6 feet in an indoor container. Although this is an easy care houseplant that just needs some bright light and a little bit of water to do well, it does have a downside.
These plants are considered poisonous and should be kept away from pets and children. Read more about common houseplants that are poisonous in Don’t Feed Me To Your Cat! A Guide to Poisonous Houseplants