| Scientific Name |
(Potamogeton crispus) |
| Classification and Permitting Level |
2 - Regulated Aquatic Nuisance Species |
| Species Description |
Curlyleaf pondweed is an invasive plant with alternate, toothed leaves that can be distinguished from our native pondweeds by its undulate leaves, which are shaped like lasagna noodles. |
| Preferred Habitat |
It is typically found fully submerged in 3 to 6 feet of water in freshwater lakes and ponds. It can survive in polluted, low light conditions and extremely cold water temperatures. |
| Reason for ANS Designation |
This plant is considered an aquatic nuisance species because it can grow quickly, forming dense mats on or near the surface and shading out native aquatic plants. Large die-offs in mid-summer can lower water oxygen levels, triggering fish kills. |
| Place of Origin |
Curlyleaf pondweed is native to Eurasia, Africa, and Australia but was introduced to the United States in the early 1800s. It can easily be transported as plant fragments on equipment. |
| Stopping the Spread |
When taking equipment out of a lake or stream, inspect it to make sure there is no aquatic vegetation. Leave any aquatic vegetation you find at the lake from which it was taken. Never release plants into the environment and plant only native species in gardens. |
| Additional Information |
USGS Fact Sheet |
