Invasive Trees and Shrubs

Non-native trees and shrubs, often planted in home landscapes for ornamental purposes, can easily escape into natural areas where they grow quickly and compete with native plants for resources.

Regulations on Woody Invasive Plants

Many invasive woody plants are regulated by the Illinois Exotic Weed Act. The act makes it illegal for anyone to buy, sell, distribute, or plant any parts of the listed species without a permit. Woody plants included in this list are: multiflora rose, buckthorns (including glossy, saw-toothed, dahurian, Japanese, and Chinese), bush honeysuckles (including spring, Amur, Morrow’s and Tatarian), and olives (including Russian, thorny, and autumn).

After removing invasive species, existing native plants may need help recovering. In some cases, replanting with native plants may be necessary for restoration. When planting native species, try to use local-ecotypes of seeds or plants from within 100 miles of your location. Local ecotypes of native plants are adapted to local climates and can be easier to grow. They also provide food and shelter for pollinators and other wildlife. Restoring diverse native plant communities will help prevent future invasions by strengthening the ecosystem, but continue to monitor for invasive species.