Quick wins for a faster PC:
Scan for outdated or missing drivers - takes under a minuteDriver Scan →Repair Windows errors before they cause bigger problemsFix Now →There is no single U.S. rule making every invasive plant illegal to possess or plant. Federal rules require permits for importing or moving designated Federal noxious weeds between states; state rules may add their own restrictions. Six examples show why contractors and property owners should check the exact plant, location and planned activity before moving or using it.
What “illegal” means for these plants
The federal restriction is specific: USDA’s Animal and Plant Health Inspection Service (APHIS) says, “USDA requires permits for the importation and/or interstate movement of Federal noxious weeds (FNWs).” The federal list appears in 7 CFR § 360.200. That permit requirement should not be misrepresented as a nationwide ban on possession or planting.
As an Amazon Associate I earn from qualifying purchases.
States may regulate additional plants. Ohio’s prohibited-noxious-weeds rule, for example, lists mile-a-minute, giant hogweed, kudzu and Japanese knotweed. That is an Ohio example, not a statement about the law in every state. The available sources do not establish, for each species, rules on possession, sale, planting, disposal, exceptions or penalties. Check the current law for the relevant jurisdiction and activity before acting.
Recommended Free Tools
Six examples—and what the evidence establishes
This is a set of examples, not a ranking from most to least dangerous. The available sources describe different kinds of impact and do not compare them using one common danger measure. Federal listings identify regulated taxa; they do not by themselves establish a relative hazard score.
#1 Best Overall
| Plant and scientific name | Legal example | Impact established in the cited material |
|---|---|---|
| Giant hogweed (Heracleum mantegazzianum) | Listed as a Federal noxious weed in 7 CFR § 360.200; Ohio also lists giant hogweed as a prohibited noxious weed. | The National Invasive Species Information Center (NISIC) reports that its toxic sap can cause skin irritation and blindness. The material does not provide a comparable severity measure against the other plants. |
| Mikania cordata | Listed as a Federal noxious weed in 7 CFR § 360.200, where its common name is given as “mile-a-minute.” | Not stated in the cited material. |
| Hydrilla (Hydrilla verticillata) | Included in the aquatic and wetland weeds in 7 CFR § 360.200. | Not stated in the cited material. |
| Water-spinach (Ipomoea aquatica) | Included in the aquatic and wetland weeds in 7 CFR § 360.200. | Not stated in the cited material. |
| Giant salvinia (Salvinia molesta) | One of the giant salvinia taxa included in the aquatic and wetland weeds in 7 CFR § 360.200. | Not stated in the cited material. |
| Mile-a-minute weed (Persicaria perfoliata) | Ohio lists it as a prohibited noxious weed. This is a state example, not a federal listing established here. | NISIC says it forms dense mats that crowd out native species. |
Two different plants share the name “mile-a-minute”
Do not identify a regulated plant from its common name alone. The federal regulation calls Mikania cordata “mile-a-minute,” while NISIC and Ohio use that common name for Persicaria perfoliata. They are different species. The federal rule explains that the scientific name identifies the listed taxon; common names in parentheses are included to help identify it. When a legal status depends on identity, check the scientific name in the applicable rule.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What this means on a construction site
A plant’s presence on or near a jobsite does not, by itself, tell you which rules apply to a proposed action. Federal permit requirements concern importing and interstate movement of listed Federal noxious weeds; state rules can cover additional species. Before moving or introducing a plant, confirm the species and check the current rules for the location and activity. Do not infer from an invasive-plant profile that possession, planting or removal is legally prohibited—or permitted.
For uncertain identification, do not rely on a general profile as removal instructions. NISIC’s profiles are educational and have no regulatory implications; the center also notes that invasiveness depends on local factors. For a suspected giant hogweed find, NISIC describes a Virginia report that directed residents to contact a Virginia Cooperative Extension agent. That is a Virginia example, not a nationwide reporting procedure.
Windows Errors? Fix Them Before They Spread
Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallOutdated Drivers Are Slowing You Down
One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchQuick Recap
Best Value
Rank #3
Which sources to check
- Federal import or interstate movement: Consult USDA APHIS’s Federal Noxious Weeds guidance and the current text of 7 CFR § 360.200 for the listed scientific taxon and permit requirements. APHIS marked its guidance page last modified September 18, 2026.
- State restrictions: Check the current state code and agency guidance for the project location. Ohio Administrative Code 901:5-37-01 is one example of a state prohibited-weeds list; its currency date was not stated in the reviewed material.
- Plant impacts and identification context: NISIC’s profiles for giant hogweed and mile-a-minute weed provide educational ecological and biological information, not a final determination of legal status.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
