A Christmas cactus, also known as Schlumbergera bridgesii, is a popular houseplant known for its festive, colorful blooms that appear during the holiday season. To keep your Christmas cactus healthy and thriving, it's important to water it properly. In general, Christmas cactuses should be watered when the top inch or so of soil feels dry to the touch. Water thoroughly until the water runs through the pot, and then allow the soil to dry out slightly before watering again. During the winter months, when the plant is in its dormant phase, water it less frequently, only when the top inch of soil feels dry