By Andi Anderson
Illinois has taken a major step to protect its natural landscapes by expanding the Exotic Weeds Act. As of October 1, 2025, the Illinois Department of Natural Resources (IDNR) added nine invasive plant species to the list of regulated plants. These species are now illegal to buy, sell, distribute, or plant in the state.
The newly regulated plants include tree-of-heaven, garlic mustard, leafy spurge, sericea lespedeza, Japanese stiltgrass, Amur corktree, black swallowwort, and pale swallowwort. Callery pear will be regulated starting January 1, 2028, giving growers time to phase out existing stock.
Invasive species are non-native plants that spread rapidly and disrupt local ecosystems. According to Chris Evans, a forestry specialist with the University of Illinois Extension, these plants can crowd out native species, reduce wildlife habitats, alter soil chemistry, and hinder the growth of native trees.
Legal regulation is a key strategy to control the spread of these harmful plants. Phil Cox, a plant ecologist with IDNR, emphasized that the updated law allows the department to respond more quickly to emerging threats.
The Illinois Invasive Species Council, which includes experts from government, research institutions, and the landscaping industry, reviewed and recommended the new additions. The council plays a vital role in identifying species that pose risks to Illinois’s environment and agriculture.
While the law does not require removal of existing plants or regulate possession, it aims to prevent further spread through human activity. Natural spread may still occur, but awareness and responsible practices can help reduce impact.
Illinois Extension staff and Master Naturalist volunteers continue to support communities by identifying invasive species and promoting management strategies. For more information, visit go.illinois.edu/InvasivePlantSpecies or contact local Extension staff.
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Categories: Illinois, Rural Lifestyle, Farm Safety