Mammillaria hahniana, native to Mexico, forms globular stems to 6" or more in diameter. Stems are densely covered with white hair, and short white spines. Concentric rings of dark pink flowers appear amidst the white hairs, creating a dramatic contrast. Easy to grow. Porous cactus soil with adequate drainage. Bright light with ample airflow. Water thoroughly when soil is dry to the touch. Protect from frost.