Picea abies outside of its native range, and one of the most economically important coniferous species in Europe. It is used as an ornamental tree in parks and gardens. It is also widely planted for use as a Christmas tree. Every Christmas, the Norwegian capital city, Oslo, provides the cities of London (the Trafalgar Square Christmas tree), Edinburgh and Washington D.C. with a Norway spruce, which is placed at the most central square of each city. This is mainly a sign of gratitude for the aid these countries gave during the Second World War. In North America, Norway spruce is widely planted,
Capitol Christmas Tree procedure was established for the installation of a yearly tree. The 1963 tree was a live Douglas-fir, purchased from a Pennsylvania nursery. It was re-decorated each year through 1967 when it was severely damaged in a wind storm and subsequently died as a result of root damage. After the 1963 tree died, white pines from Maryland were cut down and put on display for the 1968 and 1969 seasons. Beginning in 1970, trees have been provided by the U.S. Forest Service from various National Forests. The "Capitol Christmas Tree" is traditionally lit during a ceremony at the beginning of December,