By Glen Lord Holiday cactus are a group of epiphytic and semi-epiphytic cacti native to South America. In the United States these are most commonly Thanksgiving Cactus, Schlumbergera truncata; Christmas Cactus, Schlumbergera × buckleyi; and Easter Cactus, Rhipsalidopsis gaertneri. The common names are mostly recognized in the US because the majority of the bloom cycle corresponds to those holidays. In other parts of the world they are known by other names such as Spring Cactus and Zygocactus. Whatever name you know them by, they are a welcome treat as they bloom for us in the long dark days of fall and winter. These types of cactus have segmented stems consisting…