Knotweed Resources

FINAL_Duluth knotweed 2022 brochure edits 6.25.22.pdf

Duluth CISMA
Knotweed Brochure

Knotweed_Info_MDA_Knotweed Brochure 5.14.18 WEB.pdf

MN Department of Agriculture
Knotweed Brochure

Identification Resources

Additional Management Resources

Chemical treatment of knotweeds, done in the fall, is most effective.

Where to buy chemicals

The chemicals that have been most effective at managing knotweeds in Minnesota are difficult to find in typical home improvement/hardware stores. They can be purchased online. Use a surfactant to help the chemical penetrate the leaves.

Milestone (aminopyralid): this option is a 'selective' herbicide and will control broad leaf weeds and not affect grasses. MAKE SURE YOU READ THE LABEL AND APPLY ACCORDING TO DIRECTIONS. Consult the Milestone herbicide label.

Google Shopping list

Habitat (imazapyr): this option is a 'non-selective' herbicide and will control all plants it comes into contact with. Habitat can be used near waterways but MN DNR should be contacted regarding any necessary permits needed. MAKE SURE YOU READ THE LABEL AND APPLY ACCORDING TO DIRECTIONS. Consult the Habitat herbicide label.

Google Shopping list

20.06.08_DULUTH AREA CONTRACTORS_INVASIVE KNOTWEED CONTROL.pdf

Consider sharing your resources including chemicals and spraying equipment with neighbors and others who have knotweed on their property. A single bottle of the chemicals listed above will be more than enough to manage multiple sites for multiple years.

View recorded virtual knotweed workshop from August 2020:

Reported Locations of Knotweeds in Minnesota

(Data reported and verified through EDDMapS, includes reports of Japanese knotweed, Bohemian knotweed, and knotweed species (nonnative)