Ferocactus schwarziiFerocactus schwarzii at a glance: Ferocactus schwarzii begins as a spiny barrel cactus, then slowly matures into a smoother plant with deep ribs and far fewer spines than most Ferocactus species. That long transition is a large part of its appeal: over time the body becomes greener, more sculptural, and more obviously ribbed, while the plant remains solitary rather than clustering into a colony. Indoors it needs the brightest position available, a