Flowing Water Plant ID

EricaBraun(9b)June 24, 2014

I discovered this very pretty water plant today. It seems to spread by "runners," but the runners have a thickness that is more akin to branches. Every two to three feet one of these little plants sprouts up. They are only about a foot tall. The plant/plants are taking up a huge portion of a shallow lake, so it is either very vigorous, or possibly invasive. I'd love help, if anyone knows what it is.

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Purple loosestrife.

Roots are just part of the problem - one plant can produce up to 2.7 million seeds which is why it's choking up so much space along the nation's lakes, ponds, and waterways.

We've got a lovely little meandering creek across the street and down a slope - every year one of us in the neighborhood dead heads the few we get and shovels up the obvious plants that we see so it's never gotten much of a toehold along our stretch yet.

    Bookmark   June 24, 2014 at 1:29AM
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Nothing I've grown before, but it looks like Polygonum persicaria to me.

    Bookmark   June 24, 2014 at 1:37AM
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Donna, I think you might have steered me in the right direction. It really didn't look like Purple Loosestrife and it wasn't quite Polygonum persicaria, but that one looked pretty close. I ended up looking up Polygonum plants in this area and came up with Persicaria amphibia - Water Smartweed. I'm not an expert, but I'm pretty sure that's it. Apparently it's a native.

    Bookmark   June 24, 2014 at 1:51AM
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IanW Zone 5 Ont. Can.


    Bookmark   June 24, 2014 at 8:30AM
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missingtheobvious(Blue Ridge 7a)

The Persicarias were formerly named "Polygonum."

So for the Smartweeds/Lady's Thumbs/Tearthumbs/etc., anything you see as "Polygonum ------" is now correctly named "Persicaria -----."

    Bookmark   June 24, 2014 at 12:32PM
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Persicaria amphibia, aka water smartweed. As might be determined by the species designation, a water plant. A serious spreader but a native plant so not considered invasive.

    Bookmark   June 24, 2014 at 5:55PM
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Thanks for verifying, Gardengal48!

Thank you all for the help! I've been on a kick lately to identify anything interesting that I find.

    Bookmark   June 24, 2014 at 8:36PM
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