For certain types of weeds and site conditions, chemical application is the best control option. It may cause the least amount of environmental impact and have the greatest likelihood of stopping the spread and growth of a noxious weed. Chemical application is mostly used along fence-lines, sidewalk cracks, trails, and other hard to maintain areas. It is the City's policy to apply chemicals sparingly in parks, natural areas, and other open spaces.
The City of Kirkland works with King County Noxious Weeds to manage regulated weeds using prescribed best practices. Sometimes this requires pesticide application. The City is required by law to manage and remove certain regulated weed species. A few examples found in Kirkland include parrot-feather, meadow knapweed, policeman’s helmet, and giant hogweed.
City of Kirkland Parks and Public Works staff follow Pesticide Application Guidelines(PDF, 328KB) when applying pesticides on all lands the City owns or manages.