What's New
Washington Noxious Weed List 2026 additions and changes (continued)
The Washington State Noxious Weed Control Board voted on an addition to the 2026 Noxious Weed List following a public hearing in March. At the beginning of the year, waterhemp (Amaranthus tuberculatus), delta arrowhead (Sagittaria platyphylla), Black locust (Robinia pseudoacacia), and Norway maple (Acer platanoides) were put on the weed list. The new listing is:
WAC 16-750-005 Class A additions
- The addition of sunflower broomrape, Orobanche cumana
Proposed Changes to the Washington Noxious Weed List 2026 (Continued)
The Washington State Noxious Weed Control Board (WSNWCB) will hold a public hearing on March 10th, at 1:00 p.m., and in person at Chelan County Fire Hall, 232 E Wapato Ave, Chelan, WA 98816, to take comments on proposed rule-making changes to the 2026 state noxious weed list, WAC 16-750-005. The changes proposed consist of one Class A addition.
This is a continuation of the process which had an emergency Class A listing in 2025, for 90 days. The 2027 list changes will have a hearing in November 2026.
To comment on the proposed changes, written testimony can be mailed to WSNWCB; P.O. Box 42560; Olympia, WA 98504-2560, or emailed to noxiousweeds@agr.wa.gov by 5:00 p.m. Tuesday March 9th, or given via webex during the public testimony section of the hearing. To attend the hearing, contact Mary Burrows at mary.burrows@agr.wa.gov or 360-561-4428
To join the hearing virtually, click here.
Class A addition, WAC 16-750-005
- The addition of Sunflower broomrape, Orobanche cumana
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.
The emergency listing was voted on again by the Noxious Weed Control Board again, and will expire 90 days from January 23rd, 2026.
