Mammillaria pilcayensis

Mammillaria pilcayensis has whiter, shorter and very dense spination, the stems can grow up to 50 cm long.
Flower: Purplish, about 2 cm long and in diameter.

Cultivation and Propagation: Mammillaria pilcayensis is an easy to grow cultivar, just as a classic cactus, don't requires any special treatment, but need as much light as possible without burning the plant to encourage the heaviest spine formation. It is a great starter plant for the cactus grower, that readily builds up into a cluster of stems highlighted by reddish spines, further decorated by rings of purple-pink blooms.
Growth rate: It is a rapidly growing species. It offset from the base and can fill a 25 cm pot in just a few years given the best conditions.
Watering: Water regularly in summer, but do not overwater
Hardiness: It is quite frost resistant if kept dry, hardy as low as -5° C (some reports give it hardy to -12°C). However some warmth throughout the year will increase the grower's success (minimum 5° to 8°C during rest season).
Exposition: Outside bright sun, filtered sunlight or afternoon shade, inside it needs bright light, and some direct sun. Subject to sunburn if exposed to direct sun for too long. Tends to bronze in strong light, which encourages flowering and heavy wool and spine production.
Uses: It is an excellent plant for container growing. It always looks good and stays small.

Some of the information in this description has been found at desert-tropicals.com, llifle.com and cactus-art.biz

Bloom Season	Late winter/early spring
Botanical Name	Mammillaria Pilcayensis
Dormancy	Winter
Family	Cactaceae
Flower Color	Pink
Growth Habit	Cylindrical
Mature Size	1824 in.
Native Area	Mexico
Resistance	5° C