Pot: 10 cm.
A perennial cactaceous plant which resembles a columnar cactus, with many upright stems. The stems are of a distinctive bluish-green color, from which it gets its name "C. azureus". It has well-defined ribs, outlined by many dense aligned areoles and thin yellowish needle-like spines. During summer you can admire its beautiful pinkish-white nocturnal inflorescences.