Available options for 2021:
Cut the plant off about 2 inches above the ground.
Slide a long, strong wire down the hollow stem and pierce several stem segments. The wires are available for free by calling 604 485-8635.
Use Round-up (available at local garden supply centers) and spray your fresh cut and in the hollow stem with Round-up. Be sure to follow all instructions and precautions on the container label.
Call the City at 604 485-8635 for free pick up. For a small amount, please break up the tops and bag them. For a larger amount, please let us know and we can discuss the best method
The knotweed will regrow within a couple of months. Once regrowth hits about ¾” in diameter, follow the same procedure as above. Continue until regrowth stops. Alternatively, spray the new small leaves with Roundup.
If you are not comfortable with this method, please hire a local landscape contractor to assist you.
An attempt to dig out Knotweed will loosen up the soil and that allows it to regrow stronger and become more established. It will regrow from any missed piece of root. In the end, it will require more herbicide to eliminate it.
City of Powell River Parks Department
updated April 2021