Top Questions About Duckweed

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Questions About Duckweed

Asked by
B PROVOST on
May 27, 2015

Q. how deep to bury duckweed with an excavator

To kill duckweed, how deep must it be buried? We are going to use a digger, so can be quite deep.

Answered by
Downtoearthdigs on
May 27, 2015
Certified Expert
A.

I was unable to find any information about burying Duckweed.
Here is a link with more information on Duckweed.
I would also talk with your local County Extension Office.

https://www.gardeningknowhow.com/plant-problems/weeds/duckweed-control.htm

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Asked by
kkillg on
May 2, 2016

Q. duckweed

Can I use copper sulfate to kill duckweed in pond water that I irrigate the garden with?

Answered by
Downtoearthdigs on
May 4, 2016
Certified Expert
A.

We do not recommend the use of copper sulfate to kill Duckweed.
Here is an article with more information.

https://www.gardeningknowhow.com/plant-problems/weeds/duckweed-control.htm

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Asked by
gabbi.3098 on
September 28, 2016

Q. Duckweed and goldfish

How are goldfish able to kill off duckweed? Wouldn’t the duckweed kill off the goldfish due to the lack of oxygen and nutrients in the pond? What is the biological makeup of duckweed? What’s your background surrounding duckweed?

Can duckweed populate a bigger body of freshwater such as a lake (ex: Gull Lake in Brainerd, Minnesota)? If so, at what level does it populate the water? What effects does it have on the ecosystem there and at what level?

Answered by
Downtoearthdigs on
September 29, 2016
Certified Expert
A.

Goldfish, Koi and grass Carp can help with pond Duckweed, but will not eliminate it completely.
Our expertise is more geared to garden ponds, a much smaller scale then lakes.
I would suggest contacting the MN DNR for specific information on your questions.
I have listed several links for you as the very matter of aquatic weeds is well studied in the great state of MN!

https://www.gardeningknowhow.com/plant-problems/weeds/duckweed-control.htm

http://www.dnr.state.mn.us/aquatic_plants/floatingleaf_plants/duckweeds.html

http://cues.cfans.umn.edu/old/extpubs/6955aquatic/DG6955.html

http://files.dnr.state.mn.us/natural_resources/water/lakes/vegetation_reports/11021800.pdf

http://www.dnr.state.mn.us/index.html

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Asked by
Wendy english on
June 13, 2017

Q. Duckweed

I have a very small garden pond. It has been covered in duckweed for several years. Manual removal never suffices. I dislike using chemical weed killers of any sort, but if you can suggest one that is not too generally harmful I would risk it. There is one lone goldfish too, the last survivor.

Answered by
David Wynne on
June 13, 2017
A.

Try tying dry straw in a bundle, about the same size as a small bunch of flowers, and float it on top. Eventually it will start to sink and may help to solve the problem without murdering Goldy.

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Asked by
Anonymous on
June 13, 2018

Q. Duckweed

Are there any benefits to duckweed? I read it was an invasive plant, but how does it spread? Where is some good info on this plant? I want to know more. Thank you very much.

Answered by
Downtoearthdigs on
June 13, 2018
Certified Expert
A.

Yes, it can easily become invasive.
This article will help you.

https://www.gardeningknowhow.com/plant-problems/weeds/duckweed-control.htm

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