Horned pondweed floating in a cluster at the surface of the water.

Control Horned Pondweed

Many people ask how to get rid of horned pondweed. The following options can be considered for how to control horned pondweed.


Manual/Mechanical Control:

If you are considering how to remove horned pondweed, physically raking or seining this plant can be a somewhat effective method of control. However, physical control can be difficult. Horned pondweed can re-grow from any roots or seeds remaining in the water.


Herbicide Control:

There are multiple options for how to kill horned pondweed that offer great or some control.

  1. Spritflo (for ponds with no outflow) – liquid that is poured and spreads throughout the entire body of water, offers extended control.
  2. Hydrothol (for lakes) – granules that are broadcast over the plants.
  3. Dibrox (for ponds or lakes) – liquid that is diluted with water and sprayed over the plants, fast acting.  This will give some control.
  4. Semera or Flumigard (for ponds or lakes) – granules that are dissolved and mixed or liquid that is diluted with water and sprayed over the plants (early morning is best), fast acting. This will give some control.


Treatment Tips:

When treating horned pondweed,

  • Spritflo can be used at the first signs of growth.
  • With other herbicides, treat when the plants are established and actively growing.
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