Habitat: semi-desert matorral, among volcanic rocks or calcareous soil
Description: Originating in Mexico, this popular cactus reaches up to 6 ft (1.8 m) in height and spread. It has a single, globe-shaped, pale green body that stretches upwards in maturity, becoming barrel-shaped. This stem is heavily ribbed with numerous areoles sprouting radial, yellow spines. In summer, larger cacti produce a circle of vivid, yellow flowers from a crown at the top of the plant.
Culture: Frost tender but resistant to very dry conditions, they grow best in well-drained soil and a position in full sun, which will help to maintain the lustre of the spines and longevity of the flowers. Young plants are prone to mealy bug and red spider mite. Propagate from cuttings or seed.