Hedgehog cacti often grow in clusters. They are very spiny and have large flowers. The Engelmann Hedgehog cactus has long and multi-colored spines. Named after Dr.George Engelmann, a German-American botanist, who was instrumental in describing flora in western North America in the 1800’s. Also in his name are the Engelmann Oak, Engelmann Spruce, and Engelmann’s Prickly Pear.