Christmas cactus plants are popular during the holidays for their beautiful and festive flowers. They are easy to care for indoors, and require minimal attention. Keep your Christmas cactus in a bright, well-lit location, but not in direct sunlight, as it can scorch the leaves. Water the plant when the top layer of soil is dry, and make sure to drain any excess water from the pot. Fertilize with a balanced, all-purpose fertilizer once a month during the growing season, and keep the temperature between 65 and 75 degrees Fahrenheit.