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,
Christmas tree white and gold. First introduced by North American Lutherans in 1957, the practice has rapidly spread to other Christian denominations, including Anglicans, Catholics, Methodists, and the Reformed. "Chrismon" (plural "Chrismons") was adopted for the type of Christmas decoration and explained as a portmanteau of "Christ-monogram" (a Christogram). Both setting up and taking down a Christmas tree are associated with specific dates. Traditionally, Christmas trees were not brought in and decorated until Christmas Eve (24 December) or, in the traditions celebrating Christmas Eve rather than the first day of Christmas, 23 December, and then removed the day after Twelfth Night (5