Add a festive feel to indoor spaces with Christmas cactus. These popular houseplants respond to shorter days by developing flower buds that provide a colorful display in the home. Available in an array of colors, Christmas cactus can live for decades, getting larger and more spectacular as the years go by. Christmas cactus originated in Central and South America in areas where orchids commonly grow, and they grow best when placed in an area of the home that receives indirect sunlight. Like most plants, they grow best in well-drained soil. They require more water than traditional cactus, sometimes a few times a week. When watering, water thoroughly and then let the soil dry out between watering.