Mammillaria Elongata Cristata
(This plant comes in a 3.5 inch pot. You will receive a very similar plant to the one in the picture. It may or may not be blooming at the time of your purchase. The plant is shipped in its pot to prevent any damage to the roots).
Origin and habitat: The original natural habitat of this species are the states of Guanajuato, Hidalgo and Querétaro (Mexico).
Description: This is the cristata form of the Mammillaria elongata. It is a succulent ground cover, forming with time a tight clumps of erect, ascending, prostrate or recumbent stems. This may be the most common Mammillaria to be found and occurs in more variations than any other Mammillaria species.
Blooming season: Spring, but can bloom for a second time later in the year.
Cultivation and propagation: Although regarded as a choice plant is not too difficult in a greenhouse, but grows quite slowly. It is sometime seen as a grafted plant but grows very well on its own roots too.
Soil: Use mineral well permeable mineral soil with little organic matter (peat, humus).
Exposure: They need a good amount of light shade to full sun this help to keep the plants healthy, although slow growth.
Watering: Water sparingly from March till October (weekly during summertime, if the weather is sunny enough) , with a little fertilizer added. Less or no water during cold winter months, or when night temperatures remain below 10° to prevent root loss. It is sensitive to overwatering (rot prone).
Some of the information in this description has been found at desert-tropicals.com, llifle.com and cactus-art.biz