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enter image description here This plant has been growing in my pond for quite a time now. It multiplies in large numbers rapidly. Some told me it is duckweed or is it something else?

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  • $\begingroup$ Can you please edit to add additional information as specified in the "species-identification" tag (hover over or click the tag to see details). In particular, measurements of the leaf diameter might be very helpful. Thanks! 😊 $\endgroup$
    – tyersome
    Jun 13, 2020 at 0:05

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That looks very much like a duckweed.

The multiple roots rule out most genera within this group and so this is probably a Spirodela.

The apparently relatively large size and red undersides are consistent with this being Spirodela polyrhiza.

Spirodela polyrhiza by Christian Fischer (https://commons.wikimedia.org/wiki/User:Fice)

Picture by Christian Fischer available under Creative Commons Attribution-Share Alike 3.0 Unported.

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Not duck weed. It is Salvinia species very easy to grow ( invasive). I believe it is illegal to introduce in some US states. Koi /carp will eat duck weed.There are a few similar species of salvinia , unfortunately references will give the same name for different plants. My book ( Aquarium Plants ; Barry Jones, Tetra press) calls it auriculata which I believe is wrong. Auriculata is also called giant salvinia and looks different ( see comments @ tyersome ). I have grown Auriculata but not the salvinia that you have.

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  • $\begingroup$ This is not correct — Salvinia species look completely different, for example they have hairs on the leaf surface and their "roots" look completely different — see for example here: cabi.org/isc/datasheet/48444. $\endgroup$
    – tyersome
    Aug 23, 2019 at 23:55
  • $\begingroup$ I have edited to what I believe is correct. $\endgroup$ Aug 24, 2019 at 1:09

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