Since knotweed is so difficult to eradicate once it has become established, it is important to prevent new infestations and remove small patches before they spread.
Please don't mistake this plant for a good natural screen and transplant it. Knotweed has been observed growing up through asphalt and rock, between bricks, and into the interiors of homes! Importing soil is also a common means of spread, so be careful when importing soil onto your property. Digging the plants is not recommended unless it is a very small and isolated infestation (5-10 stems).
It is extremely difficult to remove all the rhizomes, and fragments of roots, and these root parts may spread the infestation and make it worse. These plant parts should never be composted in a backyard composting system. Usually a combination of cutting and chemical treatments is what is needed to manage knotweed successfully.
Please see our Control Options for Knotweeds (PDF) for more information. Timing is everything with regards to successful knotweed control so please read and follow the directions in this document. If you need additional help figuring out a method which will work for your particular site please call us for a site-specific recommendation at: 360-778-6234