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The tradition of displaying decorated fir trees in the home at Christmas dates back to the 1500's in Germany, though decorating the home with evergreen boughs during winter had been done since ancient times in Europe.
Trees and plants that stay green during the cold winter months, such as the fir tree, were believed to ward off evil spirits, and were symbols of life and resurrection.

en.wikipedia.org/wiki/National_Christmas_Tree_(United_States)

The National Christmas Tree is a large evergreen tree located in the northeast quadrant of The Ellipse near the White House in Washington, D.C. Each year ...

en.wikipedia.org/wiki/Christmas_tree_cultivation

Christmas tree cultivation is an agricultural, forestry, and horticultural occupation which involves ...... Christmas Tree Facts, Christmas Trees & More, University of Illinois. Retrieved August 25, 2007. Wolford, Ron. Tree Types, Christmas Trees ...

extension.illinois.edu/trees/facts.cfm

Christmas Tree Facts. Great Moments in Christmas Tree History. The use of evergreen trees to celebrate the winter season occurred before the birth of Christ.

www.realchristmastrees.org/dnn/Education/Quick-Tree-Facts

Quick Tree Facts. There are approximately 25-30 million Real Christmas Trees sold in the U.S. every year. There are close to 350 million Real Christmas Trees ...

www.aoc.gov/nations-stage/capitol-christmas-tree

Learn about the Capitol Christmas Tree that stands on the Capitol's West Front Lawn each winter. ... Tree Facts and Details. Information about individual trees is  ...

www.pickyourownchristmastree.org/facts.php

Obscure but true facts about Christmas and Christmas trees. This is the ... Christmas trees have been sold commercially in the United states since about 1850.

msue.anr.msu.edu/news/real_christmas_trees_history_facts_and_environmental_impacts

Dec 2, 2016 ... In this next article in a series about Christmas tree science, history and fun facts, we'll take a look at real Christmas trees and some of the facts ...

mentalfloss.com/article/71868/11-facts-you-might-not-know-about-christmas-trees

Dec 4, 2015 ... From surprising early holiday practices to current research being conducted to build a better tree, here are some lesser-known facts of these ...

oklahoma4h.okstate.edu/aitc/lessons/extras/facts/cmastree.html

Most Christmas trees are grown on tree farms. They are considered an agricultural product. For every Christmas tree harvested, three seedlings are planted in its ...