(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).
They are easy and rewarding plants than can be grown in pots or in the rock-garden. They will grow in the cooler parts of the year, and flower in winter if they get good light (direct sunlight is essential to bloom well).
Watering: They come from winter rainfall areas but in cultivation, they can be watered year-round. It is probably dormant in summer, so it is usually recommended not to water much in summer them cool, and half-shaded in summer, need full sun or light shade on the other seasons. They become stressed with inadequate light which could result in poor growth and unnatural shape. It is also perfect for a bright windowsill.
Frost Tolerance: In cultivation they like warmth (recommended minimum winter temperature 5° C) however plants kept perfectly dry are quite frost hardy (it is reported to be hardy to at least -12° C if very dry
and also reduce watering frequency in winter, but it is a very adaptable species that can grows opportunistically whenever the water availability and growing condition are favorable.
Some of the information in this description has been found at desert-tropicals.com, llifle.com and cactus-art.biz