Will Roundup Kill Duckweed In A Pond?

What Kills Duckweed? Yard and Garage
What Kills Duckweed? Yard and Garage from www.yardandgarage.com

Duckweed is a plant that is often found in water sources like ponds and lakes. It can be beneficial to the ecosystem, but it can also become a nuisance if it grows out of control. That is why many people are interested in finding out if Roundup – a popular herbicide – can be used to kill duckweed.

What is Roundup?

Roundup is a type of herbicide that is designed to kill weeds. It is made with a chemical called glyphosate, which is effective at killing a wide variety of plants, including grasses, sedges, and broadleaf weeds. It is typically used on lawns, gardens, and agricultural fields, but it can also be used in ponds and other water sources to control unwanted plant growth.

Can Roundup Kill Duckweed?

Yes, Roundup is effective at killing duckweed. The glyphosate in Roundup will kill duckweed, as well as other aquatic plants like water lilies and water hyacinths, in a pond. Roundup is available in a variety of forms, including a liquid concentrate, a ready-to-use spray, and a granular product.

How to Use Roundup to Kill Duckweed

When using Roundup to kill duckweed in a pond, it is important to use the right product and follow the manufacturer’s instructions. For best results, use a liquid concentrate or a ready-to-use spray. Granular products are not recommended for use in ponds. The amount of Roundup needed will vary depending on the size of the pond, but generally, a 2-4% solution of Roundup should be used.

Mix the Roundup with water according to the manufacturer’s instructions and pour the solution into the pond. Be sure to evenly distribute the solution throughout the pond, as this will ensure that the duckweed is killed evenly. Wait a few days to allow the Roundup to work – usually, the duckweed will start to die off within a few days.

Are there any Risks of Using Roundup in a Pond?

Yes, there are risks associated with using Roundup in a pond. Roundup is toxic to all plants, so it will kill any plants it comes in contact with. This includes beneficial plants like grasses and water lilies, as well as unwanted plants like duckweed. This can lead to a decrease in the biodiversity of the pond, which can have a negative effect on the overall ecosystem.

Additionally, Roundup can be toxic to animals that drink the water, so it is important to use caution when using it. Roundup can also be dangerous to humans, so it is important to wear protective clothing and avoid contact with the skin or eyes.

Alternative Ways to Control Duckweed

If you are looking for a way to control duckweed in a pond without using chemicals, there are some other options available. Hand-pulling is one option – simply pull the duckweed out of the water with your hands. It is important to make sure you remove the entire plant, including the roots, to prevent it from growing back.

Another option is to introduce ducks or other waterfowl into the pond. These animals will eat the duckweed, which can help to keep it under control. It is important to make sure the pond has enough food and shelter for the waterfowl, and that it is not overcrowded.


In conclusion, Roundup is an effective way to kill duckweed in a pond. However, it is important to use caution when using it, as it can be toxic to humans and animals. Additionally, it can lead to a decrease in the biodiversity of the pond, so it is important to consider other methods of controlling duckweed, such as hand-pulling or introducing waterfowl.

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