Plant ID forum: (Persicaria) and (Ambrosia); for ID

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Name: Benjamin E.
Mercer county, New Jersey, USA
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Sekreuz
Jun 29, 2015 9:33 AM CST
I'm wondering what this is.

Found it on a walk the other day. There was a bunch of it around, it seemed to be in the low and wet areas. To the top of the picture is the entrance/exit of a culvert.
It almost looks like the stalk is in segments. The larger leaves have a dark arrow pattern on them. I didn't touch or sniff it, I'm not a big fan of doing that - Dunno if it might give me a rash, or spike me with those sharp hairs (if it has any, I can't see any though).

Tried searching for an hour and I gave up LOL.

Thumb of 2015-06-29/Sekreuz/af38ba

(Bonus points if you can identify that plant right behind it, the one with the complex leaf shapes)

-Ben
Name: Greene
Savannah, GA (Sunset 28) (Zone 8b)
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greene
Jun 29, 2015 9:56 AM CST
Welcome! to ATP!

I'll take a guess. The main plant is a type of Polygonum/Smartweed and the for the bonus points I'll guess Ragweed.
(I have been known to be wrong. Whistling )
Sunset Zone 28, AHS Heat Zone 9, USDA zone 8b~~"Leaf of Faith"
Name: Jay
Nederland, Texas (Zone 9a)
Region: Texas Region: Gulf Coast Charter ATP Member I helped beta test the first seed swap I helped plan and beta test the plant database. I was one of the first 300 contributors to the plant database!
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Horntoad
Jun 29, 2015 10:37 AM CST
I agree, some type of Smartweed/Knotweed. Possible in the Persicaria genus. A lot of the Polygonums are a synonym of Persicaria but not all.
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Name: Lin
Florida (Zone 9b)
Region: United States of America Morning Glories Region: Florida Houseplants Charter ATP Member I was one of the first 300 contributors to the plant database!
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plantladylin
Jun 29, 2015 10:47 AM CST
The one in front reminds me of Persicaria maculosa: https://gobotany.newenglandwild.org/species/persicaria/macul...
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Name: Frank Richards
Clinton, Michigan

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frankrichards16
Jun 29, 2015 11:06 AM CST
Color me greene, I also think smartweed and ragweed.
Name: Greene
Savannah, GA (Sunset 28) (Zone 8b)
Rabbit Keeper Critters Allowed Celebrating Gardening: 2015 Plant Identifier Garden Ideas: Master Level Garden Sages
Herbs Region: Georgia Region: United States of America Native Plants and Wildflowers Dog Lover Composter
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greene
Jun 29, 2015 1:19 PM CST
Thumbs up Rolling on the floor laughing Frank, you are so funny.

Guess the good news is that Sekreuz doesn't have these growing in his garden so he won't have to be eradicating these plants. Thumbs up
Sunset Zone 28, AHS Heat Zone 9, USDA zone 8b~~"Leaf of Faith"
springfield MO area (Zone 6a)
I was one of the first 300 contributors to the plant database! Plant Identifier
Frillylily
Jun 29, 2015 1:57 PM CST
Not the best picture, but I had something simiar growing in my yard, I bought it at Lowes one year and it was labled "Dragon's Tongue". It grew really fast and as you can see had white little blooms. I had it for several years, and it was not invasive for me, but the soil in this area was clay-like and a little dry up next to the east side of the house. I have since tried to find the plant again but with no luck. I guess I could mail order, but didn't want to spend that much. Anyway, I think this could be the same plant you seen? I understand you all are saying it is invasive?






springfield MO area (Zone 6a)
I was one of the first 300 contributors to the plant database! Plant Identifier
Frillylily
Jun 29, 2015 1:58 PM CST
Here is a pic again, this time up against the house where you can see it better in relation to the other plants. I did have to cut it back regularly.
The sweat bees here loved it. I don't think it was fragrant.

Thumb of 2015-06-29/Frillylily/a6214a

Name: Kent Pfeiffer
Southeast Nebraska (Zone 5b)
Charter ATP Member I was one of the first 300 contributors to the plant database! Plant Database Moderator Plant Identifier Region: Nebraska Forum moderator
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KentPfeiffer
Jun 29, 2015 2:50 PM CST

Moderator

The smartweed in Sekreuz's picture is probably one of the native species which means, by definition, it can't be considered invasive. Many gardeners would, however, consider it to be a weed which is where the eradication comments are coming from I'd guess.
springfield MO area (Zone 6a)
I was one of the first 300 contributors to the plant database! Plant Identifier
Frillylily
Jun 29, 2015 3:00 PM CST
Even though it is native, it can still be invasive in a garden where most things need to be contained to a smaller area.

Name: Kent Pfeiffer
Southeast Nebraska (Zone 5b)
Charter ATP Member I was one of the first 300 contributors to the plant database! Plant Database Moderator Plant Identifier Region: Nebraska Forum moderator
Garden Sages Garden Ideas: Master Level Irises Celebrating Gardening: 2015
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KentPfeiffer
Jun 29, 2015 3:04 PM CST

Moderator

Gardeners commonly misuse the term that way, that's true. "Aggressive" would be a more accurate word.
Name: Benjamin E.
Mercer county, New Jersey, USA
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Sekreuz
Jul 28, 2015 1:58 PM CST
Ahah, yes, it does look like smartweed! Smiling

Kent is right. Exactly what I thought. Invasive is very similar, yet still different than aggressive.

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bamira
Jul 28, 2015 2:54 PM CST
https://www.google.cz/search?q=Persicaria&biw=1252&bih=602&s... I tip my hat to you.
Name: Kabby
Lowndesboro, AL (Zone 8a)
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Kabby
Jul 28, 2015 3:49 PM CST
@Frillylily Your plant is persicaria Red Dragon. It's extremely easy to pull up and also easy to root in water.
Name: Tiffany
Opp, AL (Zone 8b)
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purpleinopp
Jul 28, 2015 4:03 PM CST
As a quick reference, if leaves have a chevron & aren't a sterile cultivar, prolific seedlings can be expected.
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