What's New
Washington Noxious Weed List 2026 additions and changes
The Washington State Noxious Weed Control Board voted on the 2026 Noxious Weed List following a public hearing in November. County noxious weed control boards have 90 days from the adoption of the state weed list to adopt their own county noxious weed list. The county noxious weed list must include all class A noxious weeds and any class B noxious weeds designated by the state in their county. You can find the whole lists in WAC 16.750.
WAC 16-750-005 Class A additions
- The addition of waterhemp, Amaranthus tuberculatus
- The addition of delta arrowhead, Sagittaria platyphylla
WAC 16-750-015 Class C additions
- The addition of Black locust, Robinia pseudoacacia
- The addition of Norway maple, Acer platanoides
Emergency, temporary, Class A listing
Sunflower broomrape, Orobanche cumana, was added as a temporary emergency Class A listing. This emergency listing will last 90 days from October 21st, 2025.
Holly added to the Washington State Noxious Weed List
As of March 2025, common holly, Ilex aquifolium, is on the State Weed List as a Class C weed.
