According to an old Christian tradition, Saint Michaelmas Day (29th September) is when people should stop picking blackberries. Legend says that on this day, a battle transpired between the Archangel Michael and the devil. Michael pushed the devil into a thorny blackberry bush and the devil proceeded to scorch them with his fiery breath, which marked it as a bad omen. In some areas, people say the last day for blackberry picking is 10th October because this was the old Saint Michaelmas Day before the calendars were altered in 1752.

It is true that blackberries start to deteriorate rapidly after the end of September, which gives some credence to the superstitious mind. Across the British Isles, the story differs slightly. In England, it is said the devil spits on the blackberry bush. In Ireland, he stomps on the bush with his hooves, and in Scotland, the devil throws his cloak over them. Some say, "If you eat blackberries after Michaelmas day, you will die before the year is over."

Some people link the myth about Saint Michaelmas Day with Biblical events, such as the “Burning Bush” that God showed to Moses. Others claim the Crown of Thorns, which Jesus was made to wear before his Crucifixion, was made from a blackberry bramble.

Other superstitions involving blackberries are that babies, horses and cats never feel well when they are ripe, and if blackberries bloom in May, it is a sign of cold weather. This cold spell is known as 'Blackberry Winter'.

More Info: culinarylore.com