(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).
Mammillaria hahniaia, more commonly known as old lady cactus. It is a very globular cacti with spherical stems. It has very white hairs and a circle-like crown of bright magenta flower, which causes a beautiful contrast in colors. This is a perfect ornamental plant for any use.
Recommended temperature zone: USDA: 9b-11
Frost tolerance: Hardy to 20°F (-6°C)
Minimum avg. temperature: 50°F (10°C)
Sun exposure: Light shade
Origin: Mexico (Guanajuato)
Watering needs: Water sparingly, needs good drainage
Some of the information in this description has been found at desert-tropicals.com, llifle.com and cactus-art.biz