I was curious about the origins of "kissing under the mistletoe", and decided to google for a little information. In my search, I also ran across the legend of mistletoe, both of which I thought I would share with you.

The Legend

For its supposedly mystical power mistletoe has long been at the center of many folklore. One is associated with the Goddess Frigga. The story goes that Mistletoe was the sacred plant of Frigga, goddess of love and the mother of Balder, the god of the summer sun. Balder had a dream of death which greatly alarmed his mother, for should he die, all life on earth would end. In an attempt to keep this from happening, Frigga went at once to air, fire, water, earth, and every animal and plant seeking a promise that no harm would come to her son. Balder now could not be hurt by anything on earth or under the earth. But Balder had one enemy, Loki, god of evil and he knew of one plant that Frigga had overlooked in her quest to keep her son safe. It grew neither on the earth nor under the earth, but on apple and oak trees. It was lowly mistletoe. So Loki made an arrow tip of the mistletoe, gave to the blind god of winter, Hoder, who shot it , striking Balder dead. The sky paled and all things in earth and heaven wept for the sun god. For three days each element tried to bring Balder back to life. He was finally restored by Frigga, the goddess and his mother. It is said the tears she shed for her son turned into the pearly white berries on the mistletoe plant and in her joy Frigga kissed everyone who passed beneath the tree on which it grew. The story ends with a decree that who should ever stand under the humble mistletoe, no harm should befall them, only a kiss, a token of love. What could be more natural than to translate the spirit of this old myth into a Christian way of thinking and accept the mistletoe as the emblem of that Love which conquers Death? Its medicinal properties, whether real or imaginary, make it a just emblematic of that Tree of Life, the leaves of which are for the healing of the nations thus paralleling it to the Virgin Birth of Christ.

Kissing Under the Mistletoe

Kissing under the mistletoe is first found associated with the Greek festival of Saturnalia and later with primitive marriage rites. They probably originated from two beliefs. One belief was that it has power to bestow fertility. It was also believed that the dung from which the mistletoe would also possess "life-giving" power. In Scandinavia, mistletoe was considered a plant of peace, under which enemies could declare a truce or warring spouses kiss and make-up. Later, the eighteenth-century English credited with a certain magical appeal called a kissing ball. At Christmas time a young lady standing under a ball of mistletoe, brightly trimmed with evergreens, ribbons, and ornaments, cannot refuse to be kissed. Such a kiss could mean deep romance or lasting friendship and goodwill. If the girl remained unkissed, she cannot expect not to marry the following year. In some parts of England the Christmas mistletoe is burned on the twelfth night lest all the boys and girls who have kissed under it never marry. Whether we believe it or not, it always makes for fun and frolic at Christmas celebrations. Even if the pagan significance has been long forgotten, the custom of exchanging a kiss under the mistletoe can still be found in many European countries as well as in Canada. Thus if a couple in love exchanges a kiss under the mistletoe, it is interpreted as a promise to marry, as well as a prediction of happiness and long life. In France, the custom linked to mistletoe was reserved for New Year's Day: "Au gui l'An neuf" (Mistletoe for the New Year). Today, kisses can be exchanged under the mistletoe any time during the holiday season.