(This plant comes in a 3.5" 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).
Description: Mammillaria nivosa is a colorful cactus species, solitary but usually offsets a lot.
Flowers: Diurnal 2 cm yellowish. Stigmas yellow.
Blooming season: Early spring.
The Mammillaria nivosa is an easy to grow tropical Mammillaria, that doesn't take any frost.
Growth rate: It is a relatively rapidly growing and easily flowering species that will make large clumps given the best conditions. Most plants will offset readily, and clumps can be produced in a few years.
Some of the information in this description has been found at desert-tropicals.com, llifle.com and cactus-art.biz