National Christmas Tree (United States) tree was cut down and replaced with double row of willow oaks. In 1934, the National Christmas Tree was relocated to Lafayette Park north of the White House. The 1931 Norway spruce had again become damaged, and the National Park Service purchased two "Koster" blue spruce cultivars to plant on the west side of Sherman Square with the intent of using alternating between trees each year. But when it became clear later that year that the National Christmas Tree would have to be moved from Sherman Square, the agency asked the Commission of Fine Arts (which had partial jurisdiction over
Christmas tree cultivation urine samples. The average Christmas tree receives roughly a half of an ounce (14 g) of pesticide over its lifetime. The BBC's "Gardening" website called buying Christmas trees directly from the farm, "the most environmentally friendly way of getting a tree". Other positive environmental attributes have been given live Christmas trees as well. Researchers at the University of Nebraska included the reuse of natural Christmas trees as mulch and, in larger quantities, piled up as soil erosion barriers, among the benefits of live tree use. Other positive reuses included fish habitat in private ponds and backyard bird feeders. Since 2004,