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Is Hydrilla in Illinois?

written by
Jennifer Biancalana


In August 2019, the state of Illinois confirmed the first presence of Hydrilla, an aquatic “superweed,” in a pond located in Lake County. Here’s what you need to know:

What is Hydrilla?

Hydrilla is a fast-growing, extremely invasive aquatic plant that can quickly overtake a water body. Hydrilla plants typically have five leaves whorled around a main stem. The leaves have distinctly serrated edges. The tricky thing is that there are other non-invasive plants that look very similar to Hydrilla, but it is certainly better to err on the side of caution with this superweed.

An example of Hydrilla.

How is Hydrilla managed?

Early detection is critical to managing Hydrilla in a water body. It can spread quickly but can be brought under control when spotted early.  If you see a plant that looks anything like Hydrilla in your water body, please contact a professional aquatics services company like Clarke to assist with detection, sampling and control. Our industry at large will be working closely with the Illinois Department of Natural Resources on Hydrilla management now that it has been confirmed in the state.

Learn more about aquatic plants and waterbody management: