Mistletoe is a hemiparasite that draws water and nutrients from its host plant, but has chlorophyll and produces its own food by photosynthesis. Mistletoe rarely affects trees that are healthy, but can harm those already weakened by root damage (as from construction), drought, or pests. The word mistletoe comes from the Old English misteltan, with tan meaning “twig” and mistel meaning “dung, filth.” This makes sense when you consider that the plant’s seeds are spread by bird droppings, but perhaps it’s best not to bear in mind that you’re kissing under a “shit stick.”
In a famous Norse myth, mistletoe caused the death of the god Balder, the best loved of all immortals, by the jealous Loki. When Balder dreamed that he was about to die, he told his mother, Freya, who went to all things and made them swear that they would never harm her son. But she thought the mistletoe too weak to hurt anyone, and Loki found this out, he fashioned a dart from the plant and put it in the hand of the blind god Hodur, who stood aside while others threw things at Balder for the fun of seeing them drop to the ground before they reached him. “Here is something for you to throw,” Loki said, “and I will direct your aim.”
No one seems to know where the kissing comes from, though some claim that after Balder’s death, Freya commanded that the plant must never again bring destruction, and that those who pass under it must exchange a kiss of love and peace. Washington Irving wrote that men commonly gave women as many kisses as there were berries on the mistletoe hanging above them, plucking off one per kiss. The English hang kissing balls made with cedar and mistletoe in their doorways.