Fight against invasive exotic plants

The City of Pointe-Claire is committed to protecting and restoring local biodiversity by addressing the growing problem of invasive exotic plants.

These species, often unintentionally introduced into our ecosystems, threaten the survival of our native flora and disrupt ecological balance. Our efforts focus on identifying, controlling, and eradicating these plants through targeted municipal projects. Through these initiatives, we aim to restore and preserve the health and diversity of our green spaces for future generations, ensuring rigorous ecological management of our natural environment.

What is an invasive exotic species?

According to the definition by the Ministry of Environment, Fight against Climate Change, Wildlife and Parks, “invasive exotic species (IES) are plants, animals, or microorganisms (virus, bacteria, or fungus) introduced outside their natural range, which colonize new sites or regions rapidly and can form dominant populations. Their establishment and spread can pose a threat to the environment, economy, or society.”

Below are the ongoing projects in the city of Pointe-Claire for the management and eradication of invasive exotic plants:



Buckthorn, an invasive exotic plant, severely harms biodiversity by preventing the natural regeneration of native species. Its ability to spread quickly allows it to dominate and destabilize local ecosystems, affecting the composition, structure, and vital functions of the soil. This species poses a serious threat to our parks and natural woodlands.

Pilot eradication project at Kings and Queens Park

Launched in 2022, our pilot project aims to eliminate buckthorn in the natural areas of the park. We use an innovative method of cutting buckthorn plants and treating the stumps with a specific pathogenic fungus, which is naturally present in Quebec forests.

In spring 2024, we will begin phase 3, targeting the remaining infested areas. Our teams will proceed with manual removal of the remaining stems and cover the stumps with plastic membranes to prevent regrowth. An annual follow-up of regrowth is also planned to ensure the effectiveness of our efforts.

In June 2024, in collaboration with NouvLR as part of a compensation project for the REM, we will plant a variety of native trees and plants to fully restore this area.

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