The Cambridges have become the third generation of royals to take part in a ceremonial tree-planting in Ottawa.
The pair, like the Queen, Prince Charles and Princess Diana before them, used shovels to break ground outside Rideau Hall - the official residence of the Canadian monarch and the Governor General of Canada.
Governor General David Johnston and his wife Sharon looked on happily as the young royals added to their landscaping.
For the installation of the tree, which is said to symbolize enduring love, Prince William wore a navy suit while the Duchess of Cambridge donned a gray Catherine Walker dress.
Soon after they posed for the cameras and enjoyed an reception with veterans, war brides and their families at the Canadian War Museum.
Earlier in the day, the royal couple handed flowers to couples celebrating their 50th and 60th anniversaries.
The pair then had to prepare to head off to their next stop: Quebec.
They are expected to be met by a few protestors during their two-day visit in the French-speaking province.
More on the Canadian royal tour
Photo: © PA