Asked August 10, 2020, 5:01 PM EDT
Ingham County Michigan
MDARD is the agency that licenses all professional applicators in Michigan. You can check credentials here-
Controlling Japanese knotweed of course is not easy, and is not a once and done process. Depending upon how extensive the stand is, it will take multiple treatments to control the plants. Here are articles that discusses how the plant is controlled. You should know this process so that you can assess that whoever you hire is using the correct procedures-
There are professional garden services available. MSU does not recommend retailers or brands. If you look in local publications, The Michigan Gardener is one example available at libraries and garden centers, you will find ads for garden services . You can search the internet, for example “ professional weed removal” or something similar. Also this link to the Michigan Nursery and Landscape Assoc. may give you some leads-
If you decide to hire a service, check that herbicides they use are listed in the links to control knotweed. Even professionals will need to tackle the problem with multiple visits and/or applications.