Potential Knotweed Invasion

Potential Knotweed Invasion

One of the 100 most harmful plants in the world, The Japanese knotweed, is greatly unwelcomed by citizens of Saint-Sulpice and Lanaudière, who reside along the waterfront.

Several Japanese Knotweed plants have been located on the banks of the St. Lawrence River in Saint-Sulpice by residents along the waterfront.

“The Japanese knotweed is one of the worst 100 plants on the planet. It is a problematic plant. It is an invasive plant species with underground stems that release a toxin that prevents the establishment of other plants,” said David Dan Laterreur, co-owner of the Pépinière du Vieux Moulin in Repentigny, to provide a scientific opinion on this plant.

“I have been cutting away at this plant every second day on my land with a shovel to uproot it. If nothing is done within two or three years, the water’s edge will be infested,” said Pierre Imbeault, a local citizen along the waterfront who spoke to the public sector.

A tough plant

According to Mr. Laterreur of the Pépinière du Vieux Moulin, it can take up to two years to get rid of this plant.

“To stop it spreading, it should be cut close to the ground during the summer weeks for one year. The year after, when we begin to cut, the plant will begin to die out quickly because the stem will be exhausted,” said Mr. Laterreur.

“We asked the city to help us stop this plant, but for now, I feel that they are not going to do so,” added Mr. Imbeault.

For its part, the City of Saint-Sulpice agreed that council members will discuss this issue at the next working committee.

In addition, the ZIP Committee des Seigneuries, an organization dedicated to the protection of resources and related uses of the St. Lawrence River based in Saint-Sulpice, sent a letter to residents that Japanese knotweed may cause soil stability and causes a significant loss of biodiversity.
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LifeinQuebec.com Staff Writer

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