Prince Charles and his wife, the Duchess of Cornwall, will arrive in Halifax, N.S., on Sunday for a short four-day trip, marking the royal couple's third visit to Canada since 2009.

The tour -- which includes stops in Pictou County, N.S., P.E.I. communities, as well as Winnipeg -- is expected to be steeped in tradition.

Following in the footsteps of his grandfather, King George VI, the Prince of Wales will commemorate the tour by planting an English oak tree in Halifax's Public Gardens on Victoria Day. The tree is to be placed next to one planted by King George more than 70 years ago, in June 1939.

The royal couple's tour will also coincide with a number of significant anniversaries, including the 150th anniversary of the Charlottetown Conference. It eventually led to the Confederation.

The royal visit could be a wet one.

During the royal couple's stay in Atlantic Canada -- where they will be taking part in many outdoor activities -- it is expected to rain in parts of the region. Environment Canada forecasts rain in Halifax, Pictou County and in Charlottetown on Monday and Tuesday.

The royal tour will wrap on Wednesday, when Prince Charles and Camilla will visit Winnipeg before departing Canada.

The royal couple's last official visit to Canada was two years ago. They first visited the country as a couple in November 2009.