- Alligator Weed: Emergent plant that is green with white flowers, originating from South America that is an aggressive, mat-forming perennial. It spreads from seed or plant fragments. It causes displacement of native vegetation and can impede navigation.
- Eurasian Watermilfoil: A submergent green plants with red stems when actively growing. It's from Eurasia and was introduced to America in the 1950s. It reproduces by seed fragments, stolens, and is spread by boats, trailers, and birds. It shades out native vegetation, displaces native vegetation, and can impede navigation.
- Giant Salvinia: A free floating aquatic fern than has hair structures that look like egg beaters. It reproduces through buds and is also known as the plant from hell. It's originated from South America and decreases oxygen levels in water, kills lakes, impedes navigation, displaces native vegetation, and once you get it, it's nearly impossible to eradicate it.
These plants aren't a problems in their natural habitat because there, there are insects and disease that keeps the population under control.
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