The flowering of the blackthorn have been associated with the ancient Celtic celebration of Imbolc. Blackthorn is used in amulets and spells of protection. The Blackthorn tree is linked with warfare, wounding and death.
In Scotland, winter begins when the Cailleach (the Goddess of Winter) strikes the ground with Her Blackthorn staff.
In the Irish legend, the Pursuit of Diarmaid and Grainne, a passage describes Sadhbh eating sloe berries and becoming pregnant as a result. She gave birth to a son who was born with a lump on his head. The lump turned out to be a worm or snake. The snake was eventually killed in sacrifice for another man. In the Sword of Oscar, sloe berries are part of a sacrificial theme as well. Blackthorn’s theme in traditional stories often indicate a warrior’s death in service to the High King or tribe.
Blackthorn has been used for divining rods. As a method of trial (according to Irish legend) it would burn the skin of a liar but others were unharmed.
In England Witches would carve the Norse rune thorn on a Blackthorn stave for protection. From Christianity, Blackthorn is seen as a sinister tree and associated with Witches. Blackthorn was often used for ‘binding and blasting’. A ‘black rod’ is a Blackthorn wand with fixed thorns on the end, used to cause harm to others. In British folklore, a Witch will use a Blackthorn stang in rituals of cursing. The sharp thorns were reputedly used by English witches to pierce poppets in their curses, called the ‘pins of slumber’. In South Devon folklore in England, Witches were said to carry Blackthorn walking sticks, with which they caused much local mischief. Witches and heretics were burned on Blackthorn pyres. The Devil was said, in medieval times, to prick his follower’s fingers with the thorn of a Blackthorn tree.
