Brazilian Elodea
Egeria densa
Washington State Classification
Class B — Control Required (Designated)
Brazilian elodea is an ornamental aquatic plant that is used primarily for fish aquariums.
Required control in Region 1 (all western Washington counties)
Quick Reference
Identification
Growth Habit
Submersed freshwater perennial herb that grows underwater and is sometimes free floating. It forms dense masses of growth near the water's surface.
Leaves
Lower leaves appear in whorls of 3, and the upper leaves appear in whorls of 4 to 8. They are minutely serrated, linear and bright green.
Flowers
Brazilian elodea has male and female flowers on separate plants. So far introduced populations only have male flowers. The flowers are white, have 3 petals and are on threadlike stems.
Fruit & Seeds
Only male plants have been found here in Washington, so no seed is produced here.
Impact
Brazilian elodea is an ornamental aquatic plant that is used primarily for fish aquariums. Infestations can alter aquatic ecosystems, trapping sediment and degrading water quality. It forms dense mats that shade out other native aquatic plants, inhibits water flow, and recreational activities.
Ecology & Spread
Habitat
Brazilian elodea can be found in still and flowing waters such as lakes, ponds, streams and ditches. Please click here to see a county level distribution map of Brazilian elodea in Washington.
Spread Mechanisms
Reproduction
Brazilian elodea reproduces by roots and plant fragments.
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Control Methods
Mechanical
- Mechanical removal is not advised unless the area is entirely invaded by plants because mechanical methods may increase infestation. Small populations can be carefully handpulled if all plant parts can be removed.
Biological Control
- Triploid grass carp does find Brazilian elodea palatable but this method of control can only be used in certain situations.