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,
Trafalgar Square Christmas tree is given by the city of Oslo as a token of Norwegian gratitude to the people of London for their assistance during the years 1940-45.<br><br>A tree has been given annually since 1947." The tree lighting ceremony in Trafalgar Square takes place on the first Thursday in December and is attended by thousands of people. The ceremony, led by the Lord Mayor of Westminster, includes a band and choir followed by the switching on of the Christmas lights. Traditionally, the tree provides a focal point for Christmas carolling groups. For many in London, the tree and the accompanying carolling signals the