Top 20 Invasive Plants

The Top 20 Least Wanted Species, a list developed by ISN partners in October 2010, consists of those plants that pose the greatest threat to our region’s high quality natural areas. Half the species listed below were imported for landscaping.  For a complete list of all plants that are currently invasive in our region, or that may become invasive due to warming trends, explore our complete list of invasive plants.

View our region’s Top 20 Least Wanted Species