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When and How to Treat Invasives

Best Control Practices 

Garlic mustard

Hand removal of the entire root system of the plant is practical for small infestations.  For larger infestations, cut stems at ground level or within several inches of the ground to prevent seed production.

Herbicide, such as Roundup, may be applied for very heavy infestations.  Fire can be used but can encourage germination of stored seeds and promote growth of emerging garlic mustard seedlings.

Canada thistle

Repeated mowing or selective cutting close to the ground can reduce infestations with-in 3-4 years.  Cutting should be done at least three times per year.  Mowing should be done before flowering or it will help spread seed. 

Japanese knotweed 

Do not cut or mow the plant. Call Three Shores CISMA for treatment. A Japanese knotweed landowner permission form is available here. Please fill out the form and return it. You will be placed on the list to treat in September. 

Pieces of the plant, when in contact with the ground, will re-root and start new populations.  Disposing of the material improperly is the main cause for starting new populations.

Contact Three Shores CISMA for treatment. 906-632-9611 X121.


This page last updated on 1/5/2017.

2847 Ashmun St. | Sault Ste. Marie, MI 49783 | (906) 635-1278

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