| Toxicity | Non-toxic. |
| Control | Diver hand pulling/dredging, aquatic herbicide and installation of bottom barriers. Contact your County Weed District or local Applicator for more information. |
| Habitat | Lakes, rivers and sloughs. |
| Root | Slender, fragile and extensive root system. |
| Leaf Shape | Thread-like with four leaflets arranged around the stem. |
| Lifespan | Perennial; two years or longer. |
| Priority 2A Weed | Common in isolated areas of Montana. |
| Similar Looking Plants | Northern native milfoil and parrotfeather. |
| Important Information | Forms very dense mats of vegetation on the surface of the water; extremely rapid reproduction and can infest an entire lake within two years of introduction to the system. A plant fragment with 2 nodes (areas where leaves are located) can start a new infestation. |
