Although they are beautiful, you should not get too close to a cholla cactus. The cholla have a spine that is extremely sharp and will instantly penetrate skin, clothing or even heavy boots. Almost instantly, when the spine enters the skin, the end of spine curls into a fishhook making it virtually impossible to remove without a great deal of pain. Cholla reproduce, in part, from parts of the stems falling onto the ground. The fallen stems take root and form new cactus. For this reason, the plants grow in thick clumps. The flowers are relatively small but come in lovely colors from waxy yellow to maroon.
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