[Svennovitch]

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.

 

[Jdinh04]

Don't know much about plants but they look great!

 

[HeyPK]

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.

 

[Svennovitch]

update:

 

[shalu]

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

 

[victri]

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