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  1. Knotweed Collage
  2. Report Knotweed

    Please use the form below to report your knotweed sightings. All sightings are welcome, but we are especially interested in those near rivers. For more information on knotweeds, please view our fact sheet (PDF). All personal information is optional and will only be used by our staff if we need additional help locating your site.

  3. Where did you find knotweed?

    Please answer as many questions as possible, but don't worry if you don't know some information. Anything you can tell us helps!

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  5. This field is not part of the form submission.