In most homes when Christmas is celebrated, people set up a Christmas tree in the house. This old Yuletide custom began in Germany as the "Tannenbaum" (German for "Fir Tree"). These are traditionally evergreens, the best type being the Fir Tree which does not shed its needles or lose its fragrance. The tree may be a cut tree that is bought from a plantation or taken from the forest. Artificial trees are sometimes preferred to real trees. The Christmas tree is decorated with lights, shiny coloured balls, sparkly tinsel and other ornaments. A wreath of leaves or pine is often put on the front door of a house as a sign of welcome. Other plants that have special significance at Christmas are holly which is used as decoration and mistletoe which is hung in the centre of a room. The tradition is that people who meet under the mistletoe must kiss.