1. Skip to Menu
  2. Skip to Content
  3. Skip to Footer

Japanese Knotweed

Japanese Knotweed

Polygonum cuspidatum

Family Name:

Polygonaceae

Class: B
Other Names:  
 Why is it a noxious weed? It is a very aggressive escaped ornamental that is capable of forming dense stands, crowding out all other vegetation and degrading wildlife habitat. It can also create a fire hazard in the dormant season. It is difficult to control once established.

More Information:

 

 

 

Visit Washington State Noxious Weed Control Board Here

Washington State Weeds