Many Christmas customs are carryovers from pre-Christian celebrations. Hanging gifts on trees is supposed to stem from tree worship of the Druids, and the belief that the tree was the giver of all good things. The Druids are also partly responsible for the use of mistletoe at Christmastime. They regarded the mistletoe as sacred, made certain that it never touched the ground, and dedicated it to the Goddess of Love, which explains the kissing that goes on under it. Originally, when a boy kissed a girl, he plucked a berry from the cluster and presented it to her. When the berries were gone, so were the kisses.
Need more berries please 
