Fact Sheet
| Scientific Name |
(Myriophyllum spicatum) |
| Classification and Permitting Level |
2 - Regulated Aquatic Nuisance Species |
| Species Description |
Eurasian watermilfoil is a widespread invasive plant that is used in aquariums and water gardens that has thin, hollow stems with leaves in whorls of four. It is difficult to distinguish from native milfoils, but contains 14-24 leaflet pairs per leaf instead of the 10 or less leaflet pairs found on native milfoils. |
| Preferred Habitat |
It is typically found in 1 to 15 feet of water in freshwater or brackish lakes and ponds, though it can be found as deep as 30 feet in extremely clear lakes. They can often be found in disturbed areas. |
| Reason for ANS Designation |
This plant can grow into a dense canopy at the water's surface, decreasing native plant and animal diversity and impeding recreational activities. |
| Place of Origin |
Eurasian watermilfoil is native to Europe, Asia, and northern Africa but was first introduced to the United States in the 1880s. It can easily be transported as plant fragments on equipment and was likely first introduced from aquarium or gardening releases. |
| 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 |
