Grasses are often overlooked plants that carpet our landscapes.

Grasses easily blend into the background, making it easy for invasive grasses to take over an area. Most grasses can be categorized as either cool-season or warm-season grasses. The terms refer to when a grass has the majority of its growth. Other grasses are winter or summer annuals. By keeping in mind the periods of growth and dormancy of grasses, you can time management practices for when they can be most successful.

Invasive grasses of concern in Illinois:


Learn to identify invasive grasses

Learn the basics of grass identification.

Restore natural areas and plant native species. 

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. Native plants that are adapted to local climates and 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. 

In natural areas

Native plants for the home landscape

We have included the most common and problematic plant species of Illinois environmental, agricultural, and horticultural concern on this website. It is not a comprehensive list.