The name of the Tephrocactus genus derives from the Greek word 'tephra' - 'ash', which refers to the greyish shades of the epidermis. It is a cactus with an erect green stem and pronounced tubercles, from which the white spines face upwards. Over time, T. weberi branches out and can reach up to 20 cm in height. When it blooms you can admire its beautiful flowers of all shades of yellow. A cactus that is easy to grow, however, you have to be very careful when moving or transferring the plant, because its 'balls' come off easily.