Holiday cacti are indeed true cacti but they are not as drought tolerant as their desert-dwelling relatives. Their potting mix should be kept moderately moist. During periods of active growth, plants should be watered whenever the soil begins to feel dry to the touch. Holiday cacti require excellent drainage and plants should not be allowed to sit in saucers filled with water. Plants can be fertilized once a month from April to October with a water-soluble, balanced fertilizer such as 20-20-20 or the equivalent.
Holiday cacti do not require frequent repotting. Usually once every three years is sufficient. Check the drainage holes for excessive root growth and repot in spring if necessary.
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After holiday cacti finish flowering, cut back on water slightly until new growth appears. Then resume a regular watering and fertilizing regime. Plants can be pruned in late spring to encourage branching. Removed pieces consisting of several segments can be rooted in moist vermiculite or perlite to make more plants.
How to make more plants–Remove 2 to 5 segment sections and leave them out overnight to dry. Callous tissue will form on the cut or pinched end. Place the cut end about 1 inch deep in the moistened vermiculite or perlite. Place the starts it in a bright area but not in direct sunlight. Check the cuttings after a few weeks for roots by gently tugging on them. Once the roots are an inch or more in length.
Most holiday cacti will appreciate being set outside in a shady place during the summer months. When the temperatures drop below 50º F, it is time to bring them back inside and discontinue fertilizing. Plants can be placed in an area with 60 to 70º F days and 55 to 60º F nights. After 4 to 8 weeks, flower buds will appear.