Noxious Weeds Index

Quarantine List

The Washington State Department of Agriculture (WSDA) maintains a quarantine list of plants, also called the prohibited plants list, whose sale or distribution is prohibited in the state. All Class A Noxious Weeds and many Class B and C noxious weeds are on this list. There are also plants on the list to prevent them from being imported and spread in our state. For questions about quarantine list, contact WSDA's Plant Services Program at (360) 902-1874 or email

Additions of noxious weeds to the quarantine list within the last six years include: yellow archangel (Lamiastrum galeobdolon), butterfly bush (Buddleja davidii) except sterile cultivars, oriental clematis (Clematis orientalis)French broom (Genista monspessulana)giant reed (Arundo donax) (except variegated cultivars), and lesser celandine (Ficaria verna)

Click here to download a copy of WSDA's  brochure on the quarantine list. Click here to see the list in the Washington Administrative Code 16-752-610.

Identify a noxious weed