He had a tree in White House lawn decorated for a Christmas Tree.
There are 62 total trees in 2015. The trees have over 70,000 ornaments.
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He didn't agree that the trees should be cut down for decorations.
President Obama does put Christmas trees in the White House. As a Christian, President Obama celebrates Christmas each year with First Lady Michelle Obama and their daughters Sasha and Malia. Professional designers are brought into the White House to decorate it for Christmas and there are usually over a dozen Christmas trees with different themes. Check your TV listings since Mrs. Obama usually gives televised tours of the White House Christmas decorations. There is also a giant gingerbread "White House" that is displayed with the decorations each year.
Theodore Roosevelt declined to have a Christmas tree set up in the White House. I do not think he actually banned them. He was concerned with forest conservation and possibly objected to cutting down trees just to keep them inside for a few weeks.
It was President Theodore (Teddy) Roosevelt, but it wasn't for religious reasons. President Roosevelt was very passionate about the environment and he worried about too many trees being cut down, so he wouldn't allow a Christmas tree at the White House.
I would not say that he started a tradition, but he had an outdoor tree decorated for Christmas on the White House lawn. It was about 20 years before anymore White House Christmas trees appeared.
Theodore Roosevelt did not have a Christmas tree in the White House every year. Whether he was against having one or whether he just did not get around to having one put up is a subject for debate. It is verifiable that there was no Christmas tree in the White House in 1902, 1904, and 1922. The lack of a tree in 1902 was due to the fact that President Theodore Roosevelt had not ordered one by December 23. In 1922 First Lady Florence Harding's illness led to a more subdued Christmas celebration at the White House and no Christmas tree. For a history of Christmas Trees at the White House see related links
Christmas Trees of cause
No president had a Christmas tree in the White House for about the first 100 years. The English did not put up Christmas trees and many considered them to be a pagan custom. Christmas trees only gradually became popular in the US. However, Theodore Roosevelt, an early environmentalist, may have refused to put up a Christmas tree even though his children wanted one. The related link gives more .
The French decorate their Christmas trees with red ribbons and real white candles and baubles and hang nuts and fruits and sweets on it.