St. Clair County has no ordinance requiring or restricting native plants or prairie/naturalized landscaping. The only limit is the weed nuisance rule: plants left over eight inches on unincorporated residential lots can be cited unless they are an intentional, maintained planting.
The county does not regulate plant selection, and Illinois encourages native and pollinator plantings. Practically, native gardens must be reconciled with the county weed ordinance (Chapter 25), which targets specific listed weeds and grass over eight inches on unincorporated residential subdivision lots. A deliberately established and maintained native or prairie garden is different from neglected rank weeds, but tall growth can still draw a complaint, so keeping beds defined and edged helps. Inside a municipality, check that city's landscaping or 'natural landscape' ordinance, since some Illinois cities have adopted managed-natural-landscape provisions that expressly protect native plantings from height enforcement.
No county penalty for choosing native plants. Untended growth of listed weeds over eight inches on an unincorporated residential lot can be abated as a nuisance with cost and lien.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
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See how O'Fallon's native plants rules stack up against other locations.
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