This genus is indigenous to Mexico and the southern United States. Its name derives from the Greek words “echino” (spiny) and “kaktos” (cactus). Echinocactus grusoni is one of the world's most widely cultivated cactuses, but has become rare in its native area of Mexico. Among non-tillering cacti, Echinocactus ingens is the plant that reaches the largest size. The species native to Mexico are quite easy to grow, while those from the southern United States are not. The most variable species of the genus is Echinocactus horizonthalonius: the body colour can be blue to grey or green, with more or less long, curved or flat spines, while the flowers can be pastel colour to reddish-purple. Indigenous people of Mexico use the pulp of Echinocactus grusoni and Echinocactus ingens to make a dessert (acitron/dulce de biznaga). This is considered a federal crime, but it is still common practice, which is causing the endangerment of this genus.
