Mistletoe is related to Frigga the goddess of love and beauty. Frigga had a much-loved son,named Balder. Frigga asked all living things to promise never to harm Balder, and they did. All except the lowly mistletoe, which somehow Frigga overlooked.
Loki, a trickster god, decided to make an arrow from the mistletoe plant, and used this arrow to shoot Balder through the heart, and killed him.
Frigga's tears of grief over Balder's death were said to have turned into the berries of the mistletoe. In one version of this myth Balder was restored to life, and in gratitude Frigga made the mistletoe a symbol of love and promised to bestow a kiss upon all those who pass beneath it.