Mammillaria grahamii. (Syn: Mammillaria microcarpa) Sunset: 8-24; USDA: 8-10. Full sun to light shade. Hardy to 10° F. Water sparingly, provide good drainage. Solitary or forming mounds. Flowers have light pink outer petals, bright pink centers. Origin: California to Texas, northwestern Mexico, 1000 to 5000 feet elevation. Seeds collected near Tucson AZ.