These gorgeous cactus are called claret cups. They are relatively rare in the wild and I have only found them on very rare occasions. This plant is growing at the Desert Botanical Garden. One thing about this and other cactus flowers is that they only bloom once a year for only a few days. If you miss those days, you have to wait another year to see the blooms. Some cactus only bloom one day, once a year. Some of the most beautiful natural phenomena last only a very short time and you may only see it once in a lifetime.