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Is Purple loosestrife illegal in Wyoming?
Sources (3)
Also called: Lythrum salicaria. Last checked against official sources: 2026-10-14.
Federal noxious weed list (7 CFR 360.200): Purple loosestrife is not listed.
What Wyoming's official list says
| List / legal category | Listed as | List note | What it means |
|---|---|---|---|
| State designated noxious weed (W.S. 11-5-102), control list — every county weed & pest district must run a control program — not a sale ban | Lythrum salicaria | purple loosestrife | Not a sale ban — control-only list |
Effective dates
- The official list entry does not state a separate effective date for this species. See the linked law for when the listing took effect.
Already have it in your yard?
Control lists can require landowners or agencies to control or eradicate the plant. The list says it is not a sale ban, but control duties may apply to you as a landowner.
Native alternatives for Wyoming
- Swamp milkweed (Asclepias incarnata)
Each is recorded as native to Wyoming in the USDA NRCS PLANTS Database state distribution (retrieved 2026-10-14). Check size, sun and soil fit for your site with your local Extension office.
Purple loosestrife in other states
Alabama Alaska Arizona Arkansas California Colorado Connecticut Delaware Florida Idaho Illinois Louisiana Maine Massachusetts Michigan Minnesota Missouri Montana Nebraska Nevada New Hampshire New Jersey New Mexico New York North Carolina North Dakota Ohio Oregon Pennsylvania South Carolina South Dakota Tennessee Texas Utah Vermont Virginia Washington West Virginia Wisconsin
See every plant on Wyoming's invasive & noxious plant lists, or check any plant.
Not legal advice. PlantLegit summarizes official lists and links the source. Laws change, local (county/city) rules may add restrictions, and the official text controls. "What it means" is our plain-English label; read the exact list wording. Confirm with the agency before buying, selling or removing plants. Full disclaimer.