Echinocactus grusonii inermis uncinatusEchinocactus grusonii is endemic to east central Mexico, where it grows on sunny slopes in rich volcanic rock that allows for water to quickly drain away. It grow large and globose, usually solitary but new growth can emerge from the base of the stem. Eventually these spheres can reach over a metre in height, but with maturity the shape of the stem becomes more elongated and barrel like. Its pale green surface is heavily ribbed, with sharp spines,