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Plant Identification: Thorny weedy shrub (New Hampshire, zone 5)

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mango61
New London, NH
(Zone 5a)

November 11, 2012
11:12 AM

Post #9330392

Any ideas what this is? Photo taken yesterday. The stalks are a purplish colour. There are thorns, spread far apart from each other. Shrub about 7-8 feet tall, in a field.

Thumbnail by mango61   Thumbnail by mango61
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bryan3
Brunswick, GA

November 11, 2012
11:19 AM

Post #9330412

Sounds like a young Honey Locust tree. Long thorns. Surprisingly weedy.
mango61
New London, NH
(Zone 5a)

November 11, 2012
11:30 AM

Post #9330422

They formed a wide clump about 20 feet long, so I don't think it's a tree ...

ViburnumValley

ViburnumValley
Scott County, KY
(Zone 5b)

November 11, 2012
6:51 PM

Post #9330727

I don't see a single thorn in the images you provided.

It does look a lot like the invasive species that may go by the name Fallopia japonica now, and has been termed Japanese Knotweed and other common names. I don't believe this species is known for having thorns.

This plant can create huge masses via underground colonizing behavior, and especially likes riparian zones within which to spread - but doesn't necessarily require such conditions.

Resin

Resin
Northumberland
United Kingdom
(Zone 9a)

November 12, 2012
9:27 AM

Post #9331129

Ditto to Japanese Knotweed, definite. A seriously nasty invasive weed.

Resin
mango61
New London, NH
(Zone 5a)

November 12, 2012
1:57 PM

Post #9331380

There are thorns -- I touched them. It's not Knotweed ... we have lots of that on our street, near a brook. Knotweed has a much sturdier stem than this did.

Resin

Resin
Northumberland
United Kingdom
(Zone 9a)

November 12, 2012
2:48 PM

Post #9331425

The seed panicles have fairly sharp bristly bits which can easily be taken for thorns when dry in autumn. And the stems are starting to rot down for the winter now. Sorry, but this absolutely is Japanese Knotweed. I know it far too well.

Resin
mango61
New London, NH
(Zone 5a)

November 12, 2012
3:07 PM

Post #9331447

All I can say is that it looks nothing like the rest of the knotweed in this area right now.

GardenGuyKin

GardenGuyKin
Portland, OR
(Zone 8a)

November 12, 2012
5:26 PM

Post #9331564

Possibly this area has been treated with herbicide giving it a totally different appearance.

ViburnumValley

ViburnumValley
Scott County, KY
(Zone 5b)

November 12, 2012
5:44 PM

Post #9331579

Easy solution is to collect some of this obviously vigorous plant, and bring it back to a location where lots of closeup imagery can be procured.

Take a pic of the whole patch while you are out there, too.

GardenGuyKin

GardenGuyKin
Portland, OR
(Zone 8a)

November 12, 2012
5:54 PM

Post #9331587

VV

Thumbnail by GardenGuyKin
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ViburnumValley

ViburnumValley
Scott County, KY
(Zone 5b)

November 12, 2012
6:01 PM

Post #9331591

Hi, Kin!

Nice thumbs, and appreciated. Just back from Savannah, and I've got my Bluegrass groove going - or Orchard Grass, as the case may be.

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