Reynoutria japonica
(Itadori knotweed)
Plants
Exotic
Collection Info
Point Map
Species Profile
Animated Map
Impacts

3 results for Reynoutria japonica (Itadori knotweed)

Impact ID Scientific Name Impact Type Study Type Study Location Impact Description Reference
4675 Reynoutria japonica Competition Anecdotal N/A Japanese knotweed, Fallopia japonica, is a successful competitor. The foliage forms dense... 37069
4689 Reynoutria japonica Competition Experimental Laboratory All non-zero concentrations of Polygonum cuspidatum resulted in significant losses of... 37071
4752 Reynoutria japonica Competition Observational Field Native plant species richness and cover lower in Japanese knotweed, Fallopia japonica... 37068

View all impact types for Reynoutria japonica
Data Disclaimer: These data are preliminary or provisional and are subject to revision. They are being provided to meet the need for timely best science. The data have not received final approval by the U.S. Geological Survey (USGS) and are provided on the condition that neither the USGS nor the U.S. Government shall be held liable for any damages resulting from the authorized or unauthorized use of the data.

Disclaimer:

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. [2025]. Nonindigenous Aquatic Species Database. Gainesville, Florida. Accessed [2/26/2025].

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.