The name of the Genus Tephrocactus comes from the Greek 'tephra' - 'ash', which refers to the grayish shades of the epidermis. It is a cactus with an oval green-gray stem, which branches out over time and can reach up to 1 m in height. Its spines are very long (up to 10 cm long), rigid, straight or curved towards different directions, with a color that varies from gray to brownish. When it blooms it produces beautiful large white or light pink flowers. You have to be very careful when moving or transferring the plant, because its segments easily detach.