Extremely invasive Eurasian species that takes over wetlands and pushes most any other herbaceous wetland plant out, including Cattails, in the eastern & Midwestern USA. It forms thick monoculture colonies. Takes a big war of mowing and special herbicides to get rid of it. Flooding the area to bring the water level at least a foot higher can kill it off too.

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Class B noxious weed in Washington state. This grass forms dense colonies displacing native vegetation and degrading wetlands. Mowing can reduce infestations. Another tactic is to plant taller native trees and shrubs that will shade the grass and make it more difficult to thrive.

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