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, which belongs to the Cactaceae family, is particularly attractive with its lone spherical stems and flowers in hues of red-purple. It can grow up to approximately 4 in. (10cm) tall and 8in. (20cm) wide.