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Eurasian Watermilfoil


Eurasian Watermilfoil is an exotic species. Its leaves are feather-like that sometimes produce reddish flowers that extend above the water. Eurasian Watermilfoil's stems are red to brown in color. It can dominate a pond very quickly by fragmentation. Pieces of the plant grow roots to develop a new plant. There are many native milfoil plants that do not have as many feather-like leaves and are much less aggressive.

Mechanical Control

Eurasian Watermilfoil can be removed by cutting and raking from the pond. It will regrow from remaining roots and seeds.

Pond Dye can be used to limit sunlight into the pond. With reduced sunlight, photosynthesis cannot occur so growth will be stunted.

Chemical Control

There are several options to control Eurasian Watermilfoil:

  1. Use a season long herbicide such as Sonar™ A.S.. One treatment treats Eurasian Watermilfoil and many other common pond weeds for the season.
  2. Use a broad spectrum contact herbicide, such as Ultra PondWeed Defense®, will quickly kill Eurasian Watermilfoil. Because it does not stay in the water body, multiple treatments may be needed throughout the season.

Chemical Application Best Practices

