(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 Fence Post Cactus and Organ Cactus
Flowers: Pink to greenish.
Blooming season: Spring.
Cultivation and propagation: It is easy to grow but not very cold hardy (resistant as low as -4°C for a short time).
Sun exposure: Outside full sun, inside needs bright light, and some direct sun. In summer water the plants well and allow them to dry before watering again. During winter months, put them in a cool luminous place and encourage them to enter winter dormancy by withholding water.
Plants grown outdoor in the ground produces exceptional amounts of growth, often more than 1 m each year if kept well fed and watered throughout the warmest months, particularly if it has been acclimatized to accept full sun.
Some of the information in this description has been found at desert-tropicals.com, llifle.com and cactus-art.biz