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.

Multi-headed Candy Barrel Cactus(Ferocactus wislizeni)

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.