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Management Plan

Outstanding natural surroundings

Located in a transitional area between the estuary and maritime zones of the St. Lawrence, Grosse Île and the Isle aux Grues archipelago form the limits of the distribution of many plant species. The island’s flora and ecology present a number of highly specific features: a wide variety of habitats, more than 25 tree species, and luxuriant plantlife. Twenty-two species have been included on the list of plants that are likely to be declared endangered or threatened. Several others are at the limit of their distribution area.

Interest in the plantlife of Grosse Île dates back to at least the second half of the 19th century; members of religious orders gathered many plants that have been preserved in the herbarium at the Musée de l’Amérique française. Classification of plant life was further pursued, around 1922 and 1935, by Brother Marie-Victorin and, during the 1940s, by J.J. Sexsmith. After spending time on Grosse Île, Brother Marie- Victorin wrote that “Grosse Île is the furthest point of advance of estuarine flora into the maritime zone, and vice versa.”

In short, the natural resources of Grosse Île, such as landforms, woods, the river setting and shoreline plant life play a major role in the island’s landscapes and enhance the spirit of the place.


Commemorative integrity of the site

Commemorative intent
Resources symbolizing or representing the national significance of Grosse Île
Grosse Île and its cultural landscapes
On-site cultural resources
Movable cultural resources
Messages of national historic significance
Messages for the Canadian public
Messages for visitors to the site
Communication challenges
Other heritage values of the site
Precontact dimension of Grosse Île
Earliest settlers and agricultural use of the island before the quarantine station period
The Canadian Forces (1942-1945, 1951-1956)
Agriculture Canada (research and training station, animal quarantine)
International, national and regional links
Outstanding natural surroundings