As a substitute for mistletoe which the church forbade, holly was suggested. The sharply pointed leaves were to symbolize the thorns in Christ's crown and the red berries drops of his blood. Holly became a nativity tradition. The Christian ban on mistletoe was in effect throughout the Middle Ages. Surprisingly, as late as the 20th century, there were churches in England that forbade the wearing of mistletoe sprigs and corsages during services.