Mammillaria zeilmanniana f. monster

It is a rare cultivar, highly appreciated by cactus lovers. M. zeilmanniana f. monstrous has a green stem, completely covered with a white and woolly down. At the apex of the tubercles rare spines emerge. Like all monstrous plants, this cultivar is very different from the classic M. zeilmanniana. It is often found grafted onto other plants, due to its slow growth.