Multi-headed Candy Barrel Cactus

If the crown (head) of a Candy Barrel Cactus (Ferocactus wislizeni) is damaged, such as by extreme cold temperatures, the cactus can begin confusedly sprouting multiple heads.

If one of these new heads is itself damaged, it could also begin sprouting new heads, which would turn the poor cactus into a monstrous mass of multiplying heads.