Tricolour – Canadian Tulip Festival, Dow’s Lake, Ottawa, Ontario, Canada

The Canadian Tulip Festival is a tulip festival, held annually in May in Ottawa, Ontario, Canada. The festival claims to be the world's largest tulip festival, displaying over one million tulips, with attendance of over 650,000 visitors annually. Large displays of tulips are planted throughout the city, and the largest display of tulips is found in Commissioners Park on the shores of Dow's Lake, and along the Rideau Canal with 300,000 tulips planted there alone. Millions of tulips set the stage for a celebration of authentic art, cultural, historic, culinary and family tulip experiences at various official venues across the capital.

In 1945, the Dutch royal family sent 100,000 tulip bulbs to Ottawa in gratitude for Canadians having sheltered the future Queen Juliana and her family for the preceding five years during the Nazi occupation of the Netherlands in the Second World War. The most noteworthy event during their time in Canada was the birth in 1943 of Princess Margriet at the Ottawa Civic Hospital. The maternity ward was temporarily declared to be extraterritorial by the Canadian government, thereby allowing Princess Margriet's citizenship to be solely influenced by her mother's Dutch citizenship. In 1946, Juliana sent another 20,500 bulbs requesting that a display be created for the hospital, and promised to send 10,000 more bulbs each year.

In the years following Queen Juliana's original donation, Ottawa became famous for its tulips and in 1953 the Ottawa Board of Trade and photographer Malak Karsh organized the first "Canadian Tulip Festival". Queen Juliana returned to celebrate the festival in 1967, and Princess Margriet returned in 2002 to celebrate the 50th anniversary of the festival.