All other things being equal, the Christmas Cactus will bloom between Thanksgiving and Christmas. These easy to care for plants are hybrids of several species with a multitude of color variations. The original species are natives to Brazil and neighboring areas of South America. They are epiphytes growing in and on trees in the tropics. They derive their subsistence from the air and rainfall in tropical rainforests. The Christmas Cactus is known botanically as Schlumbergera.