Mammillaria hahniana, also known by its common name ‘Old Lady Cactus’, is a popular powder puff type cactus that is sun-loving and easy to grow. The plant belongs to the Cactaceae family. It has flowers in hues of red-purple.
Mammillaria hahniana is a sun-loving cactus that forms large groups. It grows up to 10 inches (25 cm) tall and up to 20 inches (50 cm) broad. The solitary spherical stems, up to 5 inches (12.5 cm) in diameter, are covered in white down and white spines. Reddish purple flowers, up to 0.6 inches (15 mm) in diameter, are borne in spring and summer, sometimes forming a complete ring around the apex of the plant.