Ask a Question forum: help ID evil spreading Knotweed type plant

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Hplants
Aug 12, 2016 10:57 AM CST
Hi, I have been struggling to identify a horrible plant, similar in nature to J knotweed in that it spreads vegetatively, by root or fragments, and has roots on each node, it grows in sections like knotweed. It's leaves are 10cm in length and hairy. In damp areas of soil it can grow up to 3ft in height. It thrives in semi shady moist areas amongst other plants.
The flowers are at the tip of the plant in clusters and are mostly white with pink tinge.
The plant stem is thin in diameter about 1cm, with node/sections at about 10-12cm. The stem is green with pink tinge at node areas.

Could this be Himalayan Knotweed?

Please help us help us identify this spreading plans and please could you give tips on how to irradiate it.

Many thanks!!

Thumb of 2016-08-12/Hplants/2c4fd3

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
Aug 12, 2016 11:10 AM CST
Looks like Persicaria/Knotweed. Knowing your location might narrow down the identification.
Sunset Zone 28, AHS Heat Zone 9, USDA zone 8b~~"Leaf of Faith"

Hplants
Aug 16, 2016 12:02 PM CST
Hi,

Thanks for your reply, this is in my garden in Wales:Great Britain... A very wet place.

Thanks

Hplants
Aug 16, 2016 12:43 PM CST
Hello again,

I've looked at persicaria pictures online and it looks like this. Have you any idea the best way of identifying which variety of persicaria it could be? It looks like maculosa but doesn't have the distinctive spot?

Thanks afain
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
Aug 16, 2016 1:26 PM CST
Sorry, I cannot help to make an ID. It's a beautiful plant but where I live it is necessary to pull it out as a weed.
Maybe someone with more knowledge will chime in with an identification. Thumbs up
Sunset Zone 28, AHS Heat Zone 9, USDA zone 8b~~"Leaf of Faith"
Name: Daisy
Reno, Nv (Zone 6b)
Not all who wander are lost
Garden Sages Plant Identifier
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DaisyI
Aug 16, 2016 7:30 PM CST
It doesn't matter which Knotweed it is, the eradication is the same: DIG! Dig up the plants, dig up the rhizomes, follow the runners and dig them up. Whenever a new one pops up, dig it up and follow the runners to the source (they can travel 50 or 60 feet). If a plant you want to keep is in the way, dig it up too (you can replant it after you have followed that runner).

You might be able to kill it with brush killer in the fall. Just as the leaves start to yellow, the roots are pulling nutrients down at an accelerated rate in preparation for surviving the winter. Spraying brush killer (at almost full strength) can do major damage to the plants. But it will also do major damage to any other susceptible plant nearby and it (unlike Roundup) does sink into the ground with some residual effects, especially in wet areas.

If you can cut them down to a couple inches and paint the stumps with full strength Brush Killer, it will help.

Good Luck!

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