Schlumbergera × buckleyi, commonly known as Christmas Cactus, and its relatives are very popular houseplants. When these cacti bloom, they produce colorful flowers. These beautiful flowers, with their long bloom times and easy care requirements, make them wonderful plants.
Unlike many other cacti, the Christmas Cactus is not a cactus from a hot, dry climate but rather from a tropical environment. As its name implies, the Christmas Cactus blooms at Christmas. Keeping it healthy and blooming requires understanding its needs, such as how often to water it.
When and How Often to Water
Water when the top inch of the soil is dry. Always consider the climate and time of the year. If your Christmas Cactus is outdoors in a hot, dry climate, you may need to water it every 2 to 3 days, especially if the plant has been exposed to direct sunlight. When growing cacti indoors, regardless of whether the environment is cool or humid, they may only require watering once a week. Water less during the fall and winter to help stimulate blooming.

Overwatering and Underwatering
Overwatering is a problem for the Christmas Cactus, just like other cacti, and can lead to fungal diseases such as white rot, causing leaves to drop. White rot disease is easily recognized by the white spots on the leaves.
If the Christmas Cactus does not receive enough water, it will wilt, and its flower buds will drop. A Christmas Cactus cannot tolerate completely dry soil, unlike a desert cactus. To avoid problems with fungus, avoid overhead watering.
Humidity
Christmas Cactus does best in a humid environment. This is particularly important for gardeners living in dry climates or homes with a dry indoor environment. Placing a water tray near your plant is the easiest way to provide humidity. The water evaporates into the atmosphere, providing the needed humidity. Another way is to put gravel in a dish and fill it with water before placing the potted plant. Misting your cactus with a spray bottle can also provide humidity.
Source: sfgate.com
Links
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