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I am positive this is a Polygonum.

Anyone knows what kind of Polygonum this is?





The plant was completely green when I bought it. The new growth is red.
 

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I was going to say it was the kind of Polygonum that Tropica carries, but then I checked their web site, and they don't carry it any longer. The kind they used to have developed reddish new growth in good light. As I recall, they didn't know what species it was.
 

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Looks like mine(LFS imported from Oriental Aquarium in Singapore). They just say Polygonum sp.
 

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That's really nice how you got them to redden up.

I've got 2 similar polygonums. I can't say which one yours are, the leaf shape/length look very different from what I have. Here are the pics for comparison.

Polygonum sp (from Oriental Aquarium)


Polygonum sp Sao Paulo
 
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