If the leaves of your Christmas cactus are limp, you’re either watering your cactus plant too much or it’s getting too much exposure to bright light. Excess water is not good for these plants. Check to make sure its pot has drainage holes and that its potting mix is not over-saturated with water. Also, too much light exposure is also cause for concern for the holiday cactus, so avoid giving your plant too much sun. Moderate light rather than direct sun is ideal for holiday cacti.