The Christmas cactus can be a finicky plant when it comes to blooming. It's important to provide the right amount of light and water to encourage flowering. Make sure your Christmas cactus is getting at least 14 hours of bright, indirect sunlight each day. Also, avoid overwatering your plant; it's best to water it only when the top inch of soil feels dry. If you're still having trouble with blooming, you might want to try using a fertilizer specifically designed for cacti.