(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).
Cultivation and propagation: It is a free-flowering and relatively fast growing species.
Exposition: Full sun to light shade. Best color and form in bright light.
Watering: Water thoroughly when soil is dry to the touch in summer but do not over-water. Keep dry in winter. Hardy down to -4°C.
Growing medium: Requires porous cactus soil with adequate drainage.
Growing tips: It is better that they be repotted regularly. Repotting will increase the number and size of stems, and will increase the number of flowers produced. Repot yearly until it reaches about 3 cm in size, then every two or three years will suffice. Repotting is best done at the end of winter, but it can be done at other time, too. Do not water for a couple of weeks after repotting, in order to reduce risk of root rot via broken roots. Additionally, it is important to keep growth as uniform as possible, as the long cylindrical body will readily show variations in growing conditions.
Propagation: Offsets, seeds.
Some of the information in this description has been found at desert-tropicals.com, llifle.com and cactus-art.biz