When it comes to watering your Christmas cactus, it's important to strike the right balance between too much and too little. As a general rule, you should water your cactus when the top inch or so of soil feels dry to the touch. It's also helpful to remember that during the winter months, when the plant is dormant, you should water less frequently. You can also mist your cactus periodically to provide extra moisture and humidity, but be careful not to overdo it. Too much water can lead to root rot, which can be fatal to your plant.