Plant ID forum: Japanese Knotweed (Reynoutria japonica); segmented canes

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Name: Evan
Pioneer Valley south, MA, USA (Zone 6a)
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eclayne
Aug 28, 2011 8:30 PM CST

Moderator

Love this one. Canes are hollow, extremely light and easy to crush old ones in the spring. Brown canes are last years.
Thumb of 2011-08-29/eclayne/76d071
Any ideas?
Evan
Name: Kathleen Tenpas
Wickwire Corners NY (Zone 5a)
Charter ATP Member I was one of the first 300 contributors to the plant database! The WITWIT Badge Raises cows Region: New York Farmer
Garden Ideas: Level 1
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Kathleen
Aug 29, 2011 5:04 AM CST
That is Japanese knotweed Fallopia japonica, syn. Polygonum cuspidatum, It is a horribly invasive plant that is nearly impossible to get rid of.

Name: Cinda
Indiana Zone 5b
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gardengus
Aug 29, 2011 5:09 AM CST
I agree
Keep believing ,hoping,and loving
all else is just existing.
Name: Charlie
MS.
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hementia
Aug 29, 2011 6:34 AM CST
I agree
Does it also have pink flowers or is it a related plant
Check out my daylily seedlings Daylily forum page 4
Name: Evan
Pioneer Valley south, MA, USA (Zone 6a)
Charter ATP Member Plant Database Moderator Forum moderator Aroids Irises Celebrating Gardening: 2015
I was one of the first 300 contributors to the plant database! Tropicals Foliage Fan Bulbs Hummingbirder Lover of wildlife (Black bear badge)
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eclayne
Aug 29, 2011 7:27 PM CST

Moderator

Unfortunately your ID looks spot on and it's on the prohibited list in MA. Oh well, hack, hack and another on bites the dust.
Charlie, if your asking me the flowers are white which matches the databases I've looked at.
Evan
Name: Kathleen Tenpas
Wickwire Corners NY (Zone 5a)
Charter ATP Member I was one of the first 300 contributors to the plant database! The WITWIT Badge Raises cows Region: New York Farmer
Garden Ideas: Level 1
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Kathleen
Aug 30, 2011 5:51 AM CST
The roots can go up to 4 feet deep (oh, yes, I speak from experience), so dig deep. RoundUp will eventually kill it, but any tiny bit of root will happily sprout up again. I've been fighting it for 20 years and have knocked it back a bit...

Name: Evan
Pioneer Valley south, MA, USA (Zone 6a)
Charter ATP Member Plant Database Moderator Forum moderator Aroids Irises Celebrating Gardening: 2015
I was one of the first 300 contributors to the plant database! Tropicals Foliage Fan Bulbs Hummingbirder Lover of wildlife (Black bear badge)
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eclayne
Aug 30, 2011 10:26 PM CST

Moderator

There's very little present here but it seeded from my neighbors. So while I can deal with it now I'm sure it will come calling again.
Evan
Name: Lynn
Dallas, OR (Zone 8b)
Charter ATP Member Garden Sages I helped plan and beta test the plant database. I helped beta test the Garden Planting Calendar I was one of the first 300 contributors to the plant database! Plant Database Moderator
Forum moderator I helped beta test the first seed swap Celebrating Gardening: 2015 Plant and/or Seed Trader Garden Ideas: Master Level Sempervivums
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valleylynn
Sep 4, 2011 9:28 AM CST
Crying I've been fighting it for 11 years now. Unfortunately the neighbor likes it and lets it go to bloom.
Name: Charlie
MS.
Charter ATP Member I was one of the first 300 contributors to the plant database! Daylilies Vegetable Grower Seller of Garden Stuff Ponds
Lover of wildlife (Black bear badge) Birds Farmer Seed Starter Plant and/or Seed Trader Dog Lover
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hementia
Sep 4, 2011 10:44 AM CST
The pink flowered plant I had in mind is Lady's Thumb Polygonum persicaria, a related species
All are edible,however some species may cause light-sensitive reactions
Check out my daylily seedlings Daylily forum page 4
Name: Evan
Pioneer Valley south, MA, USA (Zone 6a)
Charter ATP Member Plant Database Moderator Forum moderator Aroids Irises Celebrating Gardening: 2015
I was one of the first 300 contributors to the plant database! Tropicals Foliage Fan Bulbs Hummingbirder Lover of wildlife (Black bear badge)
Image
eclayne
Sep 4, 2011 2:57 PM CST

Moderator

I've become more aware of it since these comments and I'm seeing HUGE stands of it on the roadside here and there. The photos I posted are of a stand that's been there for quite a few years but, as it's in deep shade fighting with the White Pines for resources, it hasn't really expanded. There were several seedlings however which have been dealt with.
Evan
Name: Kathleen Tenpas
Wickwire Corners NY (Zone 5a)
Charter ATP Member I was one of the first 300 contributors to the plant database! The WITWIT Badge Raises cows Region: New York Farmer
Garden Ideas: Level 1
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Kathleen
Sep 4, 2011 7:13 PM CST
They planted it along banks to keep them from eroding - think kudzu and multiflora roses, plants that someone thought were a great idea...

Name: Lynn
Dallas, OR (Zone 8b)
Charter ATP Member Garden Sages I helped plan and beta test the plant database. I helped beta test the Garden Planting Calendar I was one of the first 300 contributors to the plant database! Plant Database Moderator
Forum moderator I helped beta test the first seed swap Celebrating Gardening: 2015 Plant and/or Seed Trader Garden Ideas: Master Level Sempervivums
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valleylynn
Sep 4, 2011 7:20 PM CST
Sad

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