The Boston Christmas Tree is the City of Boston, Massachusetts' official Christmas tree. A tree has been lit each year since 1941, and since 1971 it has been given to the people of Boston by the people of Nova Scotia in thanks for their assistance after the 1917 Halifax Explosion. The tree is lit in the Boston Common throughout the Christmas season. Halifax explosion On December 6, 1917 at 9:04:35 am, the Halifax Explosion severely destroyed much of the city, by the largest non-nuclear explosion of all time. Boston authorities learned of the disaster by telegraph, and quickly organized and dispatched a relief train around 10 pm to assist survivors. A blizzard delayed the train, which finally arrived in the early morning of December 8, and immediately began distributing food, water, and medical supplies. Numerous personnel on the train were able to relieve the Nova Scotia medical staff, most of whom had worked without rest since the explosion occurred. Nova Scotian children study the explosion in school and they know "Boston was one of the first responders, and really a lifesaver." Donation Nova Scotia donated a large Christmas tree to the city of Boston in thanks and remembrance for the help Boston Red Cross and the Massachusetts Public Safety Committee provided immediately after the Halifax Explosion of 1917. Another tree was sent in 1971, and every year since. The annual gift was started by the Lunenburg County Christmas Tree Producers Association to promote Christmas tree exports as well as acknowledge the Boston support after the explosion. The gift was taken over by the Nova Scotia Government in 1976 to continue the goodwill gesture and to promote trade and tourism. In 2017, in honor of the 100th anniversary of the explosion, Boston Mayor Marty Walsh, Halifax Mayor Michael Savage, and Nova Scotia Premier Stephen McNeil unveiled a plaque on the Boston Common near the site of the tree. The tree that year was donated in honor of first responders in the two cities. Joseph Slauenwhite donated the first two trees. The tree typically comes from the southern half of the province, but in 2014 the tree came from Antigonish County, in the north and in 2016 the first tree ever from Cape Breton Island was selected. In 2018, the first tree from Cumberland County was donated. The province also donates smaller trees to Rosie's Place and the Pine Street Inn, homeless