what makes a christmas cactus bloom

Ah, that's a good question! There are actually several different ways to encourage a Christmas cactus to bloom. One of the most important things is to make sure it has enough light during the day and enough darkness at night. They also prefer temperatures that are slightly cooler than room temperature, so try keeping it in a space that's around 60-65 degrees Fahrenheit. Additionally, you can try using a fertilizer specifically designed for Christmas cacti and make sure it's watered regularly, but not too much.