AUGUSTA, Maine (AP) Maine officials say they’ve discovered an invasive water plant growing in the state for the first time.

Officials announced Wednesday the discovery of a European frogbit infestation in Cobbossee Lake, just a week after the discovery of the also-invasive Eurasian water milfoil in the same lake. The Portland Press Herald reports while the infestation was discovered Aug. 10, the plant could have been in the area for several years.

Lakeside property owners and watershed officials fear the spread of waterborne invasive plants because they can crowd out native species and harm water quality.

European frogbit is native to Europe and northern Asia and floats on water surfaces. A 2017 state assessment found that Cobbossee Lake is one of the most vulnerable lakes for invasive plant infestation.