The golden barrel cactus (Echinocactus grusonii) is one of the most widely cultivated cacti, with an estimated 10-15 million individual plants growing around the world. They are found for sale in many nurseries.
But in its native habitat in Mexico the golden barrel cactus has become one of the most critically endangered plants on the planet.
Once numerous in the states of Querétaro and Hidalgo, most of its habitat has been inundated by the construction of a dam. As few as 50 individual plants may remain in the wild. Accordingly, the IUCN has listed it as endangered.