Holly. This name is probably a corruption of the word holy, as this plant has been used from time immemorial as a protection against evil influence. It was hung round, or planted near houses, as a protection against lightning. Its common use at Christmas is apparently the survival of an ancient Roman custom, occurring during the festival to Saturn, to which god the holly was dedicated. While the Romans were holding this feast, which occurred about the time of the winter solstice, they decked the outsides of their houses with holly; at the same time the Christians were quietly celebrating the birth of Christ, and to avoid detection they outwardly followed the custom of their heathen neighbours, and decked their houses with holly also. In this way the holly came to be connected with our Christmas customs. (See chapter on Festivals.) This plant was also regarded as a symbol of the resurrection. The use of mistletoe along with holly is probably due to the notion that in winter the fairies took shelter under its leaves, and that they protected all who sheltered the plant. The origin of kissing under the mistletoe is considered to have come from our Saxon ancestors, who regarded this plant as dedicated to Friga, the goddess of love.
The Aspen was said to have been the tree on which Judas hanged himself after the betrayal of his Master, and ever since its leaves have trembled with shame.