Origin Of  The Mistletoe

In Victorian times, kissing under the Mistletoe was a Christmas ritual that old-timers hoped would lead to romance and marriage among the younger generation.  Today, the Mistletoe is familiar to us as a Christmas decoration that results in some innocent mischief at the annual Christmas office party.  However, in ancient times, the Celts and the Vikings as a healing plant upon which superstition and myth had bestowed miraculous healing powers knew the Mistletoe. The Native American used it as a healing for dog bite toothaches and measles.                         
                             
The Mistletoe was a sacred plant in the pagan religion of the Druids in Britain.  It was believed to have all sorts of miraculous qualities: the power of healing diseases, making poisons harmless, giving fertility to humans and animals, protecting from witchcraft, banning evil spirits, bringing good luck and great blessings.  In fact, it was considered so sacred that even enemies who happened to meet beneath a Mistletoe in the forest would lay down their arms, exchange a friendly greeting, and keep a truce until the following day.  From this old custom grew the practice of suspending Mistletoe over a doorway or in a room as a token of good will and peace to all who entered.
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As For Kissing

 Many Have said that kissing under the mistletoe is a only a English custom. There's another, more charming explanation for its origin. It extends back into Norse mythology. It's the story of a loving, if overprotective, mother.  Though seasonally a Christmas custom to hang over the doorway. Don't be a bit surprised when you stand under a mistletoe you don't get kissed. 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 un-kissed, she cannot expect not to marry the following year. Whether we believe it or not, it  makes for great fun and frolic at Christmas Parties.