Ezina · A field manual for plant care · Contiguous U.S.Vol. I · Ed. 2027 · Proof copy

Invasive plants regulated in Oklahoma

Oklahoma lists 3 plants as noxious weeds under OAC 35:30-33-2. The table below reproduces that list in full, showing each plant's status in the state's own words. Oklahoma's list is an agricultural noxious-weed law, which governs control and spread on farmland and rights of way rather than what a nursery may sell.

Compiled from the rule itself, retrieved July 20, 2026. Law changes; if you spot a listing we have wrong or stale, tell us at [email protected].

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Plant Scientific name Status Oklahoma’s determination
Canada Thistle Cirsium arvense Listed Invasive Oklahoma lists Canada Thistle under “noxious weed - prohibited.”
Nodding Plumeless Thistle Carduus nutans Listed Invasive Oklahoma lists Nodding Plumeless Thistle under “noxious weed - prohibited.”
Scotch Cottonthistle Onopordum acanthium Listed Invasive Oklahoma lists Scotch Cottonthistle under “noxious weed - prohibited.”

What the tags mean

Prohibited Restricted Listed

A legal status. Oklahoma names the plant in statute. Under a nursery rule that means it may not be sold, propagated, or moved; under an agricultural weed law it means landowners must control it. The cited rule says which, in Oklahoma’s own words, in the last column.

Invasive

An ecological finding, and a different question from the law. GRIIS — the Global Register of Introduced and Invasive Species — lists the plant as invasive in the United States. Most invasive plants carry no state listing at all and are sold freely, so a plant without this tag is not thereby safe, and a plant without a legal chip is not thereby harmless.

Where this comes from

Oklahoma listings
OAC 35:30-33-2. Read the rule.
Invasive status
GRIIS, the Global Register of Introduced and Invasive Species, via GBIF. A scientific register with no legal force; it is cited separately from the statute above because the two disagree far more often than they agree.
Status wording
Each determination is written as a sentence, with Oklahoma’s own term for the plant reproduced verbatim inside it. The Prohibited / Restricted / Listed chips are Ezina’s normalisation across 42 states and are not the legal term.
Nativity
USDA PLANTS county distribution layer, surfaced through the county checker.

Regulated next door, but not in Oklahoma

Plants that two or more states bordering Oklahoma regulate, and Oklahoma does not. A listing is a legal act rather than an ecological one, so a plant can be a documented problem here and still be sold here.

Questions

What plants are illegal to sell in Oklahoma?

Oklahoma's list is an agricultural noxious-weed law, which governs control and spread on farmland and rights of way rather than what a nursery may sell. 3 plants are named under OAC 35:30-33-2. A noxious-weed listing does not automatically ban nursery sale, so check the rule itself before assuming a plant cannot be bought or sold.

Is my plant invasive in Oklahoma?

Search the table on this page, or enter the plant's name in Ezina's checker to get its Oklahoma status alongside whether USDA records it as native to your specific county. Every answer links the record it came from.

Does a plant missing from this list mean it is safe to plant in Oklahoma?

No. This page reproduces what Oklahoma regulates, and a state list is a legal instrument rather than an ecological verdict. Plenty of plants spread aggressively without ever being listed, and states add species years after the problem is documented.

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Compiled from peer-reviewed research, USDA documentation,
and direct scientific observation across the 48 contiguous states.

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