Aquatic Herbicides

Items 1 - 18 (of 18 Total) Sort By:
Rodeo Herbicide
5 out of 5 stars (31)
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A professional glyphosphate aquatic herbicide that controls aquatic weeds and plants in lakes and ponds.

Hi-Yield 2, 4-D Selective Weed Killer
4 out of 5 stars (26)
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A selective post-emergent herbicide concentrate that controls many broad-leaf weeds and other noxious plants.

Cutrine Plus Algaecide
4 out of 5 stars (11)
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A professional algaecide with a double-chelated copper solution effective for killing algae in large bodies of water.

Reward Landscape and Aquatic Herbicide
5 out of 5 stars (19)
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A professional non-selective post-emergent herbicide that rapidly kills undesirable above-ground weed growth in 24 to 36 hours.

Diquat Water Weed and Landscape Herbicide
4.5 out of 5 stars (38)
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A professional pre-emergent & post-emergent non-selective herbicide for commercial & residential indoor & outdoor water and landscape applications including greenhouses & nurseries.

Crystal Plex Algae Control
1 out of 5 stars (1)
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A professional algaecide with copper sulfate that kills Algae and some aquatic plants in ponds and lakes

Crystal Blue Copper Sulfate
5 out of 5 stars (5)
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A professional granular algaecide with copper sulfate that kills Algae in ponds.

Cutrine Plus Granular Algaecide
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A professional algaecide for planktonic and filamentous algae, Chara and Hydrilla in lakes and ponds.

Aqua Neat Aquatic Herbicide
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A professional herbicide for emerged aquatic weeds & brush in ponds and weed control for tree plantations.

Clipper Herbicide
4.5 out of 5 stars (6)
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A professional selective aquatic herbicide that controls many aquatic weeds such as water lettuce, duckweed & Algae in canals and lakes.

Opti Amine 2,4-D Amine Herbicide
5 out of 5 stars (2)
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A professional selective post-emergent herbicide that controls broad-leaf and aquatic weeds for crop, fruit trees and turf.

SePRO Sonar RTU Aquatic Weed Herbicide
5 out of 5 stars (1)
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A ready-to-use aquatic herbicide with fluridone that is quickly absorbed by weeds such as duckweed in ponds.

Roundup Custom Aquatic Terrestial Herbicide
5 out of 5 stars (2)
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A professional aquatic herbicide that controls weeds in emerged vegetation where water is present.

Nufarm Polaris Herbicide
3 out of 5 stars (3)
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A professional aquatic multi-purpose herbicide that provides control Japanese bamboo and other tough aquatic weeds.

Catt Plex
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A professional aquatic herbicide that controls cattails and others as well as broad-leaf weeds in turf-grass.

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An Algaecide that cleans pond water organically by consuming the excess nutrients in the water and cleaning it in the process.

Aqua Star Herbicide
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A professional aquatic herbicide that controls aquatic weeds and plants like cattail and water lily in lakes and ponds.

Sonar Aquatic Herbicide
Out of Stock
A professional aquatic herbicide that is a selective systematic herbicide for the management of aquatic vegetation


The weeds we battle every season in our lawns and gardens can follow us into our private lakes and ponds as well. Hooking a bunch of weeds instead of a fish, or wading through lily pads and gobs of algae just to swim is very unpleasant and you may have to take measures to control these aquatic plants. However, it can be a little tricky, since there are so many types of plants and different types of requirements. Aquatic herbicides for lake and pond weed control can make things easier with a little knowledge on the types of plants that may be in your lake or pond, and steps to take to get rid of them. Continue reading below the products on this page to learn more about controlling weeds in water.


See also: Pond & Lake Supplies, Algaecide

Aquatic Herbicide Tips

Before using any aquatic weed killers in your pond or lake to control pondweeds or lake weeds, follow these tips to make sure you are using these products correctly and safely. 

  • Identify: It is crucial to identify your pond weeds or lake weeds before you begin to treat. Some herbicides only work on certain plants.
  • Check: Make sure the product you use is licensed for use around or in water. Using unapproved chemicals can be very dangerous to swimmers and aquatic life. 
  • Follow rules: The instructions and warnings listed on all pesticide labels should be read as the law. Failure to follow these labels is illegal under state and federal laws. 
  • Pay Attention: Many aquatic herbicides will break down quickly in water, but there is still usually a suggested wait period before fishing or swimming can take place.
  • Dose properly: The dosing rates are usually listed right on the labels. It may involve some calculations, but it is important to follow the proper rates in order to keep you and your wildlife safe, as well as ensuring your product works well.
  • Apply for optimal results: Timing in the year, temperature of the water, and placement of your application will all play into the success of your treatment. Timing is especially crucial, as weeds are usually perennials and you can apply them before they even begin to cause a problem. Do a bit of research or call your local extension office to find out the best time to apply aquatic herbicides for your specific weeds and area.

Types of Aquatic Vegetation

  • Submerged vegetation: these are weeds that are rooted, but do not break the surface. This group can include Naiads, elodea, pondweeds, and Eurasian watermilfoil.
  • Emerged vegetation: These plants are rooted but grow above the water. Cattails, bulrushes, and arrowhead fall into this category.
  • Floating vegetation: These plants have leaves or flowers that float on the surface of the water and include waterlilies and watershed. 
  • Algae: Algae is a healthy part of pond or lake environments. There are different types of algae, including filamentous and mat algae. See our algae page for more information on controlling algae.

Pros and Cons of Aquatic Vegetation

Before you go out and buy an arsenal of herbicides or rent an underwater weed harvester, remember that some vegetation is desired, and is a sign of a healthy aquatic ecosystem. Here is a list of positive and negative things that you should note before doing any aquatic weed management.

When Aquatic Weeds Help:

  • Aquatic weeds, including algae, provide food for small fish, which in turn gives food to the bigger fish, providing an important piece of the food chain.
  • Larger swaths of algae or flowering plants give shelter and provide habitats to a wide variety of animals, including fish and water foul.
  • A healthy amount of aquatic plants provides abundant oxygen to aquatic life, keeping both plants and animals healthy and water cleaner.
  • Rooted plants help to stabilize the pond or lakeshore and help filter pollution.
  • Some aquatic plants provide an element of aesthetic beauty, like lily pads or cattails, which can add to your outdoor experience. 
  • Remember, your goal is management, not eradication!

When Aquatic Weeds Hurt:

  • An overabundance of vegetation can make recreational activities, like swimming, boating, or fishing, more difficult or unpleasant and detract from your enjoyment.
  • Sometimes too many weeds cause oxygen depletion, which leads to fish kills and decomposition.
  • Lots of floating or emergent vegetation can cause pockets of still water, creating breeding grounds for mosquitoes.
  • Invasive aquatic weeds can quickly overtake native species and become a problem.
  • When weeds overtake your pond or lake, it can make it very ugly, especially when algae or another small weed covers the entire surface.


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