The Sunken Garden, located in the Formal Garden, displays a focal octagonal pond with two adjoining reflecting pools. The North Dakota Homemakers and the Manitoba Women’s Institute support the two reflecting pools. The three have active water features. Octagonal walkways and plantings of trees, shrubs and flowers repeatedly encompass the pond. On the north and south walkways, two stone garden houses, financed by the North Dakota and U.S. National Homemakers’ Clubs, marks the Avenues of America and Canada.

With its thousands of perennials and ornamental shrubs it could be considered the heart of the Turtle Mountains. Perennials have been planted to help highlight the progression through the season with new varieties coming into bloom throughout the season. From one week to the next, different flowers and different colours present themselves to the observant visitor.