Ferocactus stainesii v. pilosus
(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).
Common names include Mexican Lime Cactus.
Flowers: Yellow to red.
Growth rate: Slow growing to start but does well under cultivation. They need to be moderately large before they flower.
Watering: It likes a winter's rest and should be kept completely dry during the winter months. From early spring onwards, the plant will begin to grow and watering should be increased gradually until late spring when the plant should be in full growth.
Hardiness: Keep dry at 5-10°C.
Exposition: The plant tolerates very bright situations. Strong light encourages flowering and heavy wool and spine production.
Some of the information in this description has been found at desert-tropicals.com, llifle.com and cactus-art.biz