Invasive shrubs, trees, and vines are a serious threat to native plants and natural areas in Illinois. Species such as Amur honeysuckle and common buckthorn can grow so dense that they nearly block all of the light to the forest floor. Vines, like Oriental bittersweet can wrap around trees so...
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).