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Non-herbicide treatment for Japanese knotweed

It is very difficult to remove large or well-established infestations without the assistance of herbicides.

Cutting, mowing or grazing gradually weakens the plant, but if you are using this technique you must be aware that it will take many years to exhaust the rhizome (probably more than 10 years). Cutting should be performed at least once a month during the growing season. Great care needs to be taken with the cut material to avoid further spread. Unless material can be disposed of within the confines of the property, cutting should not be adopted.

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Pulling is more effective than cutting, because it removes crown and some rhizome. However, the waste generated is highly infectious and needs to be disposed of with great care. Pulling is most effective where knotweed has recently become established, from infected topsoil for instance.

It may take many years to exhaust the widespread rhizome of an established plant.

© Cornwall Knotweed Forum.

The information on these pages has been compiled by the Cornwall Knotweed Forum from information provided by its members and partners. It is provided in good faith to the raise awareness of the issues and to promote best practice in the control of Japanese knotweed. The information may be used freely for private and educational purposes but may not be copied for commercial use. We update information and advice on a regular basis. However the Cornwall Knotweed Forum, or any of its constituent members cannot be held responsible for the efficacy of the treatments described, or any damage to persons, property or the environment that arises from interpretation of the advice given.

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