A Christmas cactus is a succulent plant that requires special care to thrive. It should be watered regularly, but not too much, as too much water can cause root rot. A Christmas cactus should also be fertilized every few months to provide it with the necessary nutrients for growth. When it comes to feeding a Christmas cactus, a balanced fertilizer with low nitrogen levels is best. This will ensure that the plant receives the nutrients it needs without becoming overfed or stunted in growth.