When did the tradition of Christmas trees get started? From history.com, this explanation: The fierce Vikings in Scandinavia thought that evergreens were the special plant of the sun god, Balder. Germany is credited with starting the Christmas tree tradition as we now know it in the 16th century when devout Christians brought decorated trees into their homes. It took a while before Christmas trees were adopted by early Americans, though. To the New England Puritans, Christmas was sacred, with no place for decorated trees – which were seen as part of ‘heathen traditions’.