PlantLegitOklahoma: invasive & noxious plant laws
New laws coming: several states phase in plant bans 2027–2030. See dates and sources →
Oklahoma's noxious weed law, 2 O.S. § 3-220, designates only three thistles as noxious weeds and requires landowners to control them every year so they do not go to seed. Seed rules (OAC 35:30-25-4) bar selling agricultural seed containing any seed of these thistles. Oklahoma has no state list of ornamental plants banned from sale. Federal noxious weeds still apply.
Official sources
- Oklahoma Noxious Weed Law, 2 O.S. § 3-220 (ODAFF, PDF)
- OAC 35:30-25-4 Limitations on noxious weed seeds
- Federal Noxious Weed List, 7 CFR § 360.200 (USDA APHIS) — applies in every state
Noxious weed (Okla. Stat. tit. 2, § 3-220), control list — landowners must keep them from going to seed — not a sale ban (3)
| Scientific name | Common name / notes |
|---|---|
| Carduus nutans | musk thistle |
| Onopordum acanthium | Scotch thistle |
| Cirsium arvense | Canada thistle |
Check plants against Oklahoma law →
Informational only, not legal advice. Lists change; always check the official source linked above before you buy, sell, plant or move a plant. Lists checked 2026-10-14.