Euphorbia Tirucalli, also known as the "Crayon Cactus" has many smooth, bright green branches. In can grow up to 6-9 meters in nature, and around 3 meters as a potted plant. It appreciates lots of bright direct light, letting the soil dry between waterings. It is best to leave the soil quite dry during winter months, as the plant goes into a sort of hibernation.  As with many other Euphorbia species, the latex from the plant is poisonous and can cause skin irritations. Please, dont let your cat eat this plant.