Hydrilla

(Hydrilla verticillata)

General description:

Hydrilla, a submerged perennial, is the most troublesome aquatic plant in the United States. It outcompetes native vegetation, acts as a breeding ground for mosquitoes, and destroys fish and wildlife. Among the aquatic species on the federal noxious weed list.

Ecological threat:

  • Invades lakes, ponds, reservoirs, rivers, and ditches. Generally found rooted at the bottom of 20’ or more of fresh, slow-moving or still water.
  • Acts as a breeding ground for mosquitoes, and destroys fish and wildlife. Water intake and delivery systems can also be severely impacted.
Giant Hogweed
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Giant Hogweed

Heracleum mantegazzianum
European Frogbit
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European Frogbit

(Hydrocharis morsus-ranae)