All hail the Blackberry, thorny fruit

Folklore in the United Kingdom is told that blackberries should not be picked after Old Michaelmas Day (11 October) as the devil (or a Púca) has made them unfit to eat, by stepping, spitting, or fouling on them. There is some value behind this legend as wetter and cooler weather often allows the fruit to become infected by various molds such as Botryotinia which give the fruit an unpleasant look and may be toxic.

Source: Blackberry – Wikipedia, the free encyclopedia