It's a perennial plant with spiny, segmented leaves that can be red, pink, purple, or white. It's commonly known as the Christmas cactus because it blooms in December. As for its safety for cats, the plant is mildly toxic to cats and can cause vomiting, diarrhea, and drooling if eaten. It's best to keep the plant out of reach of your cat and to monitor their behavior around it. If you're worried about your cat eating the plant, you can keep it in a room that your cat doesn't have access to.