The flowerpots in Tobermory on Georgian Bay were formed after years of rain, wind, waves and ice wore away at the cliff at the water's edge. The softer rock eroded more quickly until the shape of a 'flowerpot' emerged from the harder rock.
The flowerpots in Hopewell Cape on the Bay of Fundy have been formed by tidal erosion. The Bay of Fundy has the highest tides in the world. The extremes mean that the base of these rocks are covered in water twice a day. The only way to view them at ground level is at low tide.
In 1903, one of the three stacks at Flowerpot Island collapsed.
In 2016, part of one of the Hopewell Rocks - Elephant Rock - collapsed.