This species is from the Minas Gerais Mountains in Brazil. One of the best forms within the Cactaceae, this species can grow quite large, and the spines on the fluted margins, as well as the generally green-purple body, are the big attractions. We’ve had these plants outdoors in Tucson, where they have been undamaged at 20F under shadecloth. These plants are seedlings in 4-inch pots.