Eurasian Watermilfoil

Description

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.
  3. Use Clipper, a fast and selective herbicide that controls tough invasive and nuisance aquatic plants.

Chemical Application Best Practices

Anytime you use chemicals treat weeds and algae, please keep in mind the following:

  • Treat your pond in sections. Treat only half the pond's surface at a time. During hot weather or when treating heavy growth, it is important to treat no more than ¼ of your pond at a time and wait the full 14 days before re-applying. This helps lower the risk of fish loss during hot weather or when treating heavy growth.
  • Once the weeds have browned & died, use a weed cutter & rake to remove as much dead material as possible. This prevents an accumulation of dead plant material and muck.
  • Take a proactive approach to pond management. Use PondClear, MuckAway and Pond Dye to keep your pond looking great. For more information, see our article on the Airmax® Ecosystem

Ask an Expert

If you are unable to identify your pond weed(s) using our Weed ID Guide, follow this article to email us a photo.

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Products

  • Navigate® Granular Aquatic Herbicide

    Navigate® Granular Aquatic Herbicide

    Easy-To-Use Granular Formula Great For Floating & Submerged Control Weeds Surrounding Docks & Shorelines This simple to use, Navigate ® granular aquatic herbicide is perfect for spot treating weeds around docks, beach areas and...
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    $229.99
  • Pond Logic® Ultra PondWeed Defense® Aquatic Herbicide

    Pond Logic® Ultra PondWeed Defense® Aquatic Herbicide

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    Broad Spectrum Pondweed Control Fast Acting Liquid Formula Short Term Control Of Duckweed Pond Logic ® Ultra Pondweed Defense ® works on pond weeds including submerged, floating and emergent weeds. This pond herbicide may be used for short...
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    $49.99–$149.99
  • Aquathol® Aquatic Herbicides

    Aquathol® Aquatic Herbicides

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    Eliminate Submerged Weeds Available in Liquid or Granular Formulas Great For Use In Turbid Ponds Aquathol ® aquatic herbicide effectively eliminates a wide variety of submerged weeds. As potency is unaffected by surrounding organics, Aquathol...
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    $139.99–$329.99
  • SePRO Sonar™ A.S. Aquatic Herbicide

    SePRO Sonar A.S. Aquatic Herbicide

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    Season Long Weed Control Treats Floating & Submerged Weeds Systemic Herbicide That Kills Roots Even the most persistent weeds don't stand a chance against Sonar™. SePRO Sonar™ A.S. Aquatic Herbicide can be used to control stubborn...
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    $239.99–$2,399.99
  • Valent® Clipper™ Aquatic Herbicide

    Valent® Clipper Aquatic Herbicide

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    Fast & Selective Control Of Weeds Treats Floating & Submerged Weeds Dissipates Quickly Through Water Column Valent ® Clipper ™ Aquatic Herbicide delivers fast and selective control of tough invasive and nuisance plants such as...
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    $229.99–$899.99
  • SePRO Total Pond - Prevent®

    SePRO Total Pond - Prevent®

    Prevent & Control Weeds All Season Systemic Herbicide That Kills Roots Easy-To-Apply Granular Formulation SePro Total Pond - Prevent ® controls a wide variety of submerged and floating aquatic vegetation with a single treatment. Prevent...
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    $84.99
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