The common name "pincushion cactus" refers to this and the closely related genus Escobaria. Ribs: About 13 sharp, occasionally spiraled. After the flower is finished and dropped off, the stem closes over the fruit and the fruit/seed gradually ripens within. Mammillaria herrerae plants for sale. Fertilizer: only one time during the growing phase. 1. The 100 or more white radial spines create a lacy and friendly surface, smooth to the touch. The same process applies in spring and fall. Altitude: 1.300 - 1.920 m. This beautiful and peculiar cactus