Fallopia japonica
(Japanese knotweed)

Impact ID4682
Impact TypeHuman Health
Study TypeAnecdotal
Study LocationN/A
Impact DescriptionDecaying plant material from In times of flooding, dense stands of Japanese knotweed, Fallopia japonica, on the bankside impede flow and may exacerbate flooding, washed into rivers can create blockage and increase the risk of flooding, causing damage to urban flood protection schemes.
Great Lakes RegionNo

Return to impacts listing for Fallopia japonica


The data represented on this site vary in accuracy, scale, completeness, extent of coverage and origin. It is the user's responsibility to use these data consistent with their intended purpose and within stated limitations. We highly recommend reviewing metadata files prior to interpreting these data.

Citation information: U.S. Geological Survey. [2024]. Nonindigenous Aquatic Species Database. Gainesville, Florida. Accessed [2/28/2024].

Contact us if you are using data from this site for a publication to make sure the data are being used appropriately and for potential co-authorship if warranted.

For general information and questions about the database, contact Wesley Daniel. For problems and technical issues, contact Matthew Neilson.