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

Check out our Illinois grasses website.

How to Identify Nuisance Grass

There are many nuisance grass species. While we may not want to see these grasses out in the field, it’s important to know how to tell them apart from more desirable species.

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. 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.

    Resources for planting native 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.