Check us out on Facebook!

error: missing options. Please check module settings.

Washington State Weeds

Himalayan Knotweed

Himalayan Knotweed

Persicaria wallichii

Family Name:


Class: B
Other Names: bell-shaped knotweed
 Why is it a noxious weed? It grows vigorously into dense colonies that exclude native vegetation, alters natural ecosystems and is difficult to eradicate. It poses a significant threat to riparian areas, where it can survive severe floods. Small fragments can form new plants.

More Information:




Visit Washington State Noxious Weed Control Board Here