- This plant was mentioned by the owner of the RV we rented in July 2023. His property extended to the Skykomish River in his backyard. While showing us, he mentioned the state was coming out to remove Japanese knotweed, which he described as a bad plant. July 30, 2023.
- Reynoutria japonica (wikipedia.org)
Reynoutria japonica, synonyms Fallopia japonica and Polygonum cuspidatum, is a species of herbaceous perennial plant in the knotweed and buckwheat family Polygonaceae. Common names include Japanese knotweed and Asian knotweed. It is native to East Asia in Japan, China and Korea. In North America and Europe, the species has successfully established itself in numerous habitats, and is classified as a pest and invasive species in several countries.
