Mammillaria hahniana (old lady cactus) is one of the very best cacti, suitable for beginners yet also much admired by experts. Each of our plants have wonderful long hair - as much, or more than, as illustrated in our photo - greatly adding to the visual appeal of this cactus. Rings of rose-red flowers appear in May/June, which really stand out against the white background. This is the last batch we are ever going to grow, so when they're gone they're gone. 5.5cm pot size.