MICHIGAN, USA — Authorities are alerting residents about the spread of Japanese Knotweed, an invasive plant currently in bloom across Michigan.
This plant can reach nearly ten feet in height and has the strength to break through concrete. While it is already well-established in the state, experts are working to control its spread.
Japanese Knotweed, when mature, forms a large shrub with spiky white flowers. Its stems are coated in a fine white substance that easily rubs off, and the flowers bloom in August and September.
The plant poses a serious problem due to its aggressive growth. It overtakes native plants by blocking sunlight and releasing chemicals that inhibit the growth of competing flora.
“Japanese Knotweed is highly competitive and can outgrow native plants that are crucial to our ecosystem,” said Murielle Garbarino of the Ottawa Conservation District. “These native plants support pollinators and insects that are essential to our food chains.”
Garbarino added that the plant’s lack of natural predators makes it especially difficult to manage.
Removing Japanese Knotweed is challenging, but if it is growing on your property, experts advise taking action now. A herbicide like Round-Up has been found to be 94% effective. It is important to thoroughly soak the plant, though complete eradication may take a couple of years. Garbarino, who manages the West Michigan Cooperative Invasive Species Management Area, emphasizes the need to follow herbicide instructions carefully.
Due to its strength, Japanese Knotweed can damage structures like driveways and home foundations. To prevent this, ensure the plant does not grow near these areas.
For further assistance, residents can contact their county conservation office.