The crown of thorns plant stands around 36 inches when full grown and has dark green stems. It has long spindly arms that reach out in all directions. It resembles a Cactus but the thorns cover the entire plant except for the flowers it produces. On the top of each of the long stems is a cluster of beautiful flowers. Pink, yellow, red and white are the colors of these flowers and they are surrounded by bright green, pointy leaves. These plants can be potted or arranged in a garden.