Illinois law designates noxious weeds and requires landowners to control them on all property regardless of municipal weed ordinances.
The Illinois Noxious Weed Law (505 ILCS 100) directs the Department of Agriculture to designate noxious weeds such as Canada thistle, musk thistle, and perennial sow thistle. Every landowner, including municipalities, must control designated weeds on their property. County weed commissioners may enter property to inspect and order eradication. The Exotic Weed Act (525 ILCS 10) similarly bans sale and propagation of listed invasive species statewide.
Noncompliance is a petty offense; the county may eradicate weeds and assess costs as a property lien under 505 ILCS 100/8.
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