Where does it grow?

What is the distribution in Washington State?

Click on map to enlarge.

• Brazilian elodea has been documented throughout western Washington. Refer to map for distribution levels in specific counties.
• Distribution map is based on 2003 data.

How do I control it?

General control methods: Brazilian elodea can be difficult to control.  Since it spreads by stem/rhizome fragements, mechanical methods such as cutting, harvesting and underwater tilling is not advisable. These methods can increase infestation. Entire plant must be removed.

Cultural: Small infestations may be able to be controlled with the use of an opaque fabric that blocks light from the plant. Hand pulling may be employed, but entire plant must be removed or it will resprout.

Herbicide: Because herbicide availability and regulation differ between States, as well as between countries, we recommend the Washington Department of Ecology web site for information on aquatic weed management and herbicides.

Mechanical: Not advised unless area is entirely invaded by plants. Otherwise, mechanical methods may increase infestation.

Biological: Triploid grass carp does find Brazilian elodea palatable.

Are there plants that may be confused with Brazilian elodea?

For more information