Wash. Admin. Code § 16-302-105
The following weeds are considered objectionable noxious weeds for the purpose of seed certification.
| english orcommon name | botanical orscientific name |
| Blackgrass or slender foxtail | Alopecurus myosuroides |
| Blue lettuce | Lactuca tatarica |
| Docks and sorrel | Rumex spp. |
| Field pennycress (fanweed) | Thlaspi arvense |
| Field sandbur, Coast sandbur | Cenchrus spinifex |
| Halogeton or clustered barilla salt | Halogeton glomeratus |
| Medusahead | Taeniatherum caput-medusea subsp. caputmedusae |
| Plantains | Plantago spp. |
| Poverty weed | Iva axillaris |
| Puncturevine | Tribulus terrestris |
| St. Johnswort, Klamathweed | Hypericum perforatum |
| Dalmation toadflax | Linaria dalmatica |
| Yellow toadflax | Linaria vulgaris |
| Western ragweed, Perennial ragweed | Ambrosia psilostachya |
| Wild mustard | Sinapis arvensis subsp. arvensis |
| Wild oat | Avena fatua |
| Gromwell (in small grain) | Buglossoides arvensis |
| Bedstraw | Galium spp. (in alfalfa only) |
| Black mustard | Brassica nigra |
| Brown mustard | Brassica juncea (in rapeseed or canola only) |
| Wild radish | Raphanus raphanistrum |
| Dyers woad | Isatis tinctoria |
[Statutory Authority: RCW 15.49.005, [15.49].021, [15.49].310, [15.49].370, 15.140.030, and chapter 15.49 RCW. WSR 25-09-035, s 16-302-105, filed 4/9/25, effective 5/10/25. Statutory Authority: RCW 15.49.005, 15.49.081, 15.49.310, 15.49.370(3), and chapter 34.05 RCW. WSR 14-20-050, § 16-302-105, filed 9/25/14, effective 10/26/14. Statutory Authority: Chapter 15.49 RCW. WSR 09-16-006, § 16-302-105, filed 7/22/09, effective 8/22/09. Statutory Authority: Chapters 15.49, 17.24, and 34.05 RCW. WSR 06-01-111, § 16-302-105, filed 12/21/05, effective 1/21/06. Statutory Authority: RCW 15.49.005, 15.49.081, 15.49.310, 15.49.370(3) and chapter 17.24 RCW. WSR 00-24-077, § 16-302-105, filed 12/4/00, effective 1/4/01.]