About half of all invasive, noxious weeds are escapees from gardens; the rest are plants accidentally introduced to Washington through human travel and trade. Learn More about WA's Noxious Weeds Laws. Get Involved in the Noxious Weed Listing Process

There are a number of mapping databases, programs and opportunities to use and get involved with in Washington. Online sources for maps. The Washington State Department of Agriculture (WSDA) created county level distribution maps of each of Washington's noxious weed species.

Check with your county noxious weed control board about local disposal options. Biological Control Loosestrife beetles, Galerucella calmariensis and Galerucella pusilla , adults and larvae impact plant growth and reproduction by feeding heavily on the plant's leaves, stems and buds.

Class A Noxious Weeds are non-native species whose distribution in Washington State is still limited. Eradicating existing infestations and preventing new infestations are the highest …

These districts, where established, conduct ongoing weed surveys, set local weed control priorities, provide technical information on weeds and control options, and work to achieve voluntary landowner compliance with state weed law (including carrying enforcement actions as …

For questions about the quarantine list, contact the Washington State Department of Agriculture's Plant Services Program at (360) 902-1874 or email [email protected]. Why Is It a Noxious Weed? It forms dense canopies outcompeting native species and increasing soil erosion.

Check with your county noxious weed control board about how to best dispose of plant parts. Plants can be dried and burned but make sure to check with local burning restrictions and if any permits are needed.

Please refer to the PNW Weed Management Handbook, or contact your county noxious weed coordinator. For More Information. See our Written Findings for more information about gorse (Ulex europaeus). Report on gorse from the book "Weed Control in …

Why Is It a Noxious Weed? Adapted to a wide range of soil and climate conditions, common crupina can form solid stands which decreases forage for livestock. Common crupina is also federally listed as a noxious weed.

For questions about the quarantine list, contact the Washington State Department of Agriculture's Plant Services Program at (360) 902-1874 or email [email protected]. Why Is It a Noxious Weed? Garlic mustard’s vegetative growth starts early in the spring, outcompeting native and beneficial species that are still dormant.