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 PlantServices@agr.wa.gov.
Recent additions of noxious weeds to the quarantine list by WSDA 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).Identify a noxious weed