Invasive Plant Rules in Rock Island County, IL (2026)
2 rules for unincorporated Rock Island County, Illinois.
Verified from official government sources
Prohibited Species
Rock Island County's health and sanitation code bans every plant Illinois classifies as a noxious weed on any property, county-wide. Section 90.34(C) prohibits noxious weeds outright and ties the definition directly to the state's Noxious Weed Law, giving the county Health Authority the same enforcement teeth it uses against overgrown weeds and grass.
Noxious Weeds Banned in Rock Island County
Some RestrictionsRock Island County Code of Ordinances § 90.34(C)
(C) Noxious weeds. All noxious weeds shall be prohibited. A NOXIOUS WEED means any plant declared by the state to be a noxious weed pursuant to 505 ILCS 100/1 et seq.
Tree-of-Heaven Removal
Rock Island County's zoning code names Ailanthus, commonly called tree of heaven, on its list of prohibited trees for required landscaping in the unincorporated county. Section 154.597 bars developers from counting this fast-spreading, weak-wooded species toward any mandatory parking-lot screening or bufferyard planting requirement.
Tree of Heaven Banned in Rock Island County Landscaping
Light RestrictionsRock Island County Code of Ordinances § 154.597(A)
§ 154.597 PROHIBITED TREES. The following weak-wooded trees and generally undesirable trees for urban conditions shall be prohibited for use in meeting any of the landscaping/screening requirements for off-street parking areas and/or bufferyard requirements: (A) Ailanthus (tree of heaven); (B) Box elder; (C) European mountain ash; (D) European white birch; (E) Poplar; (F) Siberian elm; (G) Silv...
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