Christmas cactus are best grown in a pot, but they can also be planted in the ground. They prefer warm, sunny locations with moist soil and plenty of room for the roots to spread. Water them regularly and keep them well-fertilized. Be sure to repot the cactus every couple of years to ensure it has enough space to grow. If you are growing the cactus in a pot, make sure it has plenty of drainage holes and use a well-draining potting mix. Christmas cactus are relatively low-maintenance plants, but they do require regular care to keep them healthy and looking their best.