Here I am offering a pint plant of Pencil Tree Euphorbia tirucalli for the price of 1. They can reach 8 feet tall and are quite easy to grow if placed in direct sunshine or very bright indirect light. When your plant becomes to tall, cut it back to the desired height. Wear gloves and a long sleeve shirt when pruning Pencil Cactus. Pencil cactus is not a true cactus but a member of the Euphorbia family from tropical parts of Africa and India. Tiny leaves appear at the ends of new branches when new growth occurs, but they quickly fall. Native to Central Africa This thornless succulent thrives in full sun. Treat as you would any houseplant.