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Updated 05/10/04 Clopyralid in Compost
To view PDF files, download Acrobat Reader. General InformationEffective March 1, 2002, herbicides containing the active ingredient clopyralid may not be used on lawns and turf in the state of Washington. The purpose of the ban is to keep clopyralid, a long-lasting herbicide, from potentially contaminating compost. Golf courses are exempt from the current ban as long as no grass clippings, leaves or other vegetation are removed from a course and sent to a composting facility that provides product to the public. Additional restrictions, effective June 28, 2002, limit the purchase of clopyralid products for use on wheat and other cereal grains as well as grass grown for hay to licensed pesticide applicators. Clopyralid kills broadleaf weeds, such as dandelions, clover and thistles, and has been registered for use in this state since the late 1980s. Evidence has been growing that when clopyralid-tainted compost is used to enrich soils, it can harm certain flowers, such as asters and sunflowers, and vegetables, such as beans, peas and tomatoes. This page provides links to information about the state's regulation of clopyralid in compost and other related documents. Fact SheetNews Releases
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