Bottle Trees were sometimes placed near the entrance to the house, so the spirits did not enter the house with you. The spirits would become mesmerized by the play of the sunlight through the colors of the glass, and become trapped inside the bottles.
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According to legend, evil spirits cannot resist crawling into the colored glass of the Bottle Tree. Once inside the bottles, they become trapped and are destroyed by the morning sun. The Bottle Tree is one of the oldest traditions in the South.