A Christmas cactus is a type of succulent that's native to Mexico, so it's adapted to dry, arid conditions. To care for it, you should water it once a week, making sure the soil is completely dry between waterings. Place it in a bright spot that doesn't receive direct sunlight. Be sure to feed it once a month during the growing season with a balanced fertilizer. Prune it in the spring to keep it compact and bushy. And be sure to keep the temperature between 60-75 degrees Fahrenheit.