The common holiday cacti (Thanksgiving Cactus, Christmas Cactus, Easter Cactus) have many Latin names, but are closely related. They are all cultivated plants, originating in the mountains north of Rio de Janeiro in Brasil, South America.
Holiday CactusSchlumbergera-hybrid:
Christmas Cactus at bloom
Christmas Cactus, (Schlumbergera Bridgesii, Schlumbergera x buckleyi, Epiphyllum x buckleyi).
Easter Cactus, (Schlumbergera gaertneri - former Rhipsalidopsis gaertneri).
Some Holiday Cacti are hybrids between Schlumbergera truncata and Schlumbergera russelliana from about 150 years ago in England. The original plants grow as epiphytes at elevations between 1000 and 1700 meters in the Organ Mountains.
One flaw of the holiday cacti is that the joints of the plants are quite fragile and can break apart if the plant is in poor health. The flower buds' joints are especially easy to detach.
Open Directory Project: Schlumbergera (http://www.dmoz.org/Science/Biology/Flora_and_Fauna/Plantae/Magnoliophyta/Magnoliopsida/Cactaceae/Schlumbergera/)
Christmascactus (Schlumbergera bridgesii) is a popular, winter-flowering houseplant native to Brazil, available in a wide variety of colors including red, purple, oranges, pinks and creams.
Christmascactus is a member of a group sold as holiday cacti that includes the Thanksgiving cactus (Schlumbergera truncata) and the Easter cactus (Rhipsalidopsis gaertneri).
The Christmas cacti commonly drops unopened flower buds, which may be induced by an excessive number of buds or a sudden change in temperature, light or other environmental factors, such as drying out of the growing medium.
While the Christmascactus can adapt to low light, more abundant blooms are produced on plants that have been exposed to high light intensity.
The ideal soil for Christmascactus is composed of equal parts of garden loam, leaf mold and clean coarse sand (not sand from the seashore).
Christmascactus usually is re-potted in the spring, but a plant which is unhealthy because of the root system can be re-potted at any time of the year.