Christmas cactus is another foolproof house plant which will provide years of reliable annual color. We will choose the nicest available plant in colors ranging from shades of red, pink, white or yellow. Provide bright light to full sun and always grow your Christmas Cacti in a room which you don’t have the lights on and use at night time. They require a period of uninterrupted darkness, which coincides with natural day length, to set flower buds. Allow to dry thoroughly between waterings. Sold in a 4″ pot 14 fl. Oz. (414 ml).