Also known as Thanksgiving Cactus, Christmas Cactus or Zygo Cactus.
If temperatures are kept steady near the 68°F (20°C) mark, flowering can continue for eight weeks or more. To induce flowering for the coming year, place your Christmas Cactus in a dark room for 12-14 hours on fall nights. For best flowering results, pinch off any plant segments less than 1 cm long in early September.