Japanese Knotweed - Ask Extension
Our non profit corporation has a large backyard and the neighbor has Japanese knotweed. It has moved into our yard and is taking over our statues. We ...
Knowledgebase
Japanese Knotweed #869933
Asked May 24, 2024, 12:19 PM EDT
Our non profit corporation has a large backyard and the neighbor has Japanese knotweed. It has moved into our yard and is taking over our statues. We cut it to the ground last year and it is now 12 foot tall and spreading. Any ideas? I could send you pictures if necessary
Stark County Ohio
Expert Response
Barbara,
Japanese Knotweed is an invasive species. It is a native of Japan.
Proper identification is recommended before action is taken. https://www.oipc.info/uploads/5/8/6/5/58652481/10factsheetjapaneseknotweed.pdf
There is an effort to identify and manage plants such as these. OSU is encouraging folks to report locations of where this plant is growing using the Great Lakes Early Detection Network (GLEDN) app. If you have not used the app before, it is an easy app that includes invasive plants, insects, diseases, and wildlife. The app uses the EDD maps were locations of the reported species are indicated once verified. For additional information about the GLEDN app, check out the website or search your App Store on either your iPhone or android phone at https://apps.bugwood.org/apps/gledn/ https://bygl.osu.edu/node/1290
Thank you.
Japanese Knotweed is an invasive species. It is a native of Japan.
Proper identification is recommended before action is taken. https://www.oipc.info/uploads/5/8/6/5/58652481/10factsheetjapaneseknotweed.pdf
There is an effort to identify and manage plants such as these. OSU is encouraging folks to report locations of where this plant is growing using the Great Lakes Early Detection Network (GLEDN) app. If you have not used the app before, it is an easy app that includes invasive plants, insects, diseases, and wildlife. The app uses the EDD maps were locations of the reported species are indicated once verified. For additional information about the GLEDN app, check out the website or search your App Store on either your iPhone or android phone at https://apps.bugwood.org/apps/gledn/ https://bygl.osu.edu/node/1290
Thank you.
Don't know how an app will help me deal with the problem.
How can I get rid of it?
Thank you
Barbara
On 5/24/2024 12:34 PM, Ask Extension wrote:
I understand. The app suggestion was intended to get you assistance to identify the plant, as there are others that behave in a similar way, and address the problem. The app helps report it to the state so they can assist in determining the best solutions.
Whether the plant growth is on public or private property, near other essential plants, structures, water resources etc., are key pieces of information needed before treatment.
There is a process for elimination that typically requires two seasons. Eliminating the rhizomes (underground root system) takes herbicide applications. I cannot recommend a particular program for this without actual plant identification and suggest a professional recommended application.
https://extension.psu.edu/japanese-knotweed
Whether the plant growth is on public or private property, near other essential plants, structures, water resources etc., are key pieces of information needed before treatment.
There is a process for elimination that typically requires two seasons. Eliminating the rhizomes (underground root system) takes herbicide applications. I cannot recommend a particular program for this without actual plant identification and suggest a professional recommended application.
https://extension.psu.edu/japanese-knotweed
