Hydrilla is NOT currently known to be in Lake George. Early detection of this potential invasive species in shoreline or dock areas is key to its management. Hydrilla is part of our Lake George Invaders Watch citizen science program. If you think you have found Hydrilla, please contact us.
Hydrilla (Hydrillaverticillata) is a submerged perennial that is currently present in 15 New York State waterbodies. Due to its ability to spread rapidly and completely clog waterways, hydrilla poses significant threats to the aquatic ecosystem and recreational resources. Hydrilla can reduce plant diversity by outcompeting native aquatic plants. Dense infestations of hydrilla can affect water quality and impede water flow, which can result in flooding and damage to shorelines and structures. Thick mats of hydrilla make swimming and other recreational activities difficult, if not impossible.
This plant is tolerant of a wide range of environmental conditions and can be found in lakes, ponds, reservoirs, rivers, canals, and drainage ditches. It has low light requirements and thrives in both high and low-nutrient waters.
Hydrilla looks similar to American waterweed (Elodea canadensis), which is a native aquatic plant in Lake George. Hydrilla is a potential invasive species that has visibly serrated leaves that grow in whorls of 3-8. Undersides may have one spine or more, and the midrib of each leaf is often reddish. Hydrilla spreads by seeds, tubers, plant fragments, and turions (overwintering buds). Use the photos here and this checklist for hydrilla identification to help you identify this plant.