This high-altitude subspecies is a robust summer grower, coordinating its main vegetative structural expansion and metabolic push with the warm days and seasonal rainfall of the southern hemisphere's summer. It pushes large, pale pinkish-white flowers with contrasting dark red throats directly from the woolly areoles near the apex during late spring and early summer. As the sharp autumn drop in temperature arrives, it enters a profound, highly cold-tolerant winter dormancy to withstand the freezing, bone-dry alpine nights. In cultivation, it demands an exceptionally porous, sharp-draining mineral substrate (such as 80% to 90% pumice, crushed granite, and clay fragments) with very minimal organic matter. It should be watered thoroughly only when the pot is completely dry during the active summer months, and kept strictly dry and well-ventilated throughout its winter rest to prevent root loss.