Ferocactus stainesiiFerocactus stainesii at a glance: Ferocactus stainesii, also known as Ferocactus pilosus, is a Mexican barrel cactus valued for dense fiery red spines over a deep green body with pronounced ribs. Younger plants are usually solitary, but with age many specimens begin to clump, creating a more dramatic mass of cylindrical barrels rather than a single stem. In cultivation it stays more compact than the multi metre plants seen in habitat, yet it still