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Ghillie Dhu, a Scottish fairy who wears moss and leaves, is said to live in birch thickets. According to the Hanes Taliesin, from the 13th century Red Book of Hergest: "On a switch of birch was written the first Ogham inscription in Ireland, namely seven B's, as a warning to Lug son of Ethliu, to wit, 'Thy wife will be seven times carried away from you into fairyland or elsewhere, unless birch be her overseer."
It was taboo to eat blackberries in Celtic countries cause des fes, because of the fairies.
Blackthorn trees and shrubs are said to be held sacred by fairies. The Luantishees are blackthorn fairies, who guard the trees. November 11 is their festival.
Some consider bluebells the most potent plant for fairy magic. Fields of bluebells are said to be so dangerously enchanted by fairies that a child who wanders into one may be held captive there by the fae. Adults who enter bluebell patches may become so enchanted that they are unable to leave until other humans come to lead them out.
Plant bluebells to attract fairies to your garden. They are said to be called to their midnight revels by the sound of bluebells chiming. If you hear a bluebell ringing, this indicates the presence of a malicious fairy.