Budding Christmas Cactus When To Water. It would be best to water your christmas cactus from the base so that the water can soak down into the soil and fully hydrate the roots. This means paying careful attention.
A lack of water and dramatic temperature swings can cause flower buds to drop more rapidly. Water the christmas cactus with a good soak once per week and mist the leaves twice per week to recreate the optimal watering cycle and humidity of the christmas cactus native environment.