A Christmas cactus is a type of succulent that is native to South America, and it's known for its beautiful, vibrant flowers that bloom during the holiday season. To trim a Christmas cactus, start by removing any dead or damaged leaves from the plant. Then, use sharp scissors to trim off any branches that are overgrown or out of place. Be careful not to trim too much at once, as this can stress out the plant. After trimming, water the cactus thoroughly and let it sit in a bright, sunny location.