Japanese Knotweed

Author
Discussion

camgear

Original Poster:

6,941 posts

196 months

Sunday 12th April 2009
quotequote all
My OH's parents have a honking great bit of land in there back garden that's directly backing onto an active railway line, but they've not been able to do anything with the land because it's overrun with knotweed, are the Railway responsible for clearing it? (as I recently was told), if not, what's the best way, fire?

thesilentpartner

136 posts

209 months

Sunday 12th April 2009
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It is possible to get rid of, however is very expensive. From memory I think you have to dig down around 5 metres, ie below the roots to make sure its gone for good.

I remember watching a documentary on it & there is a bug/insect of some sort which kills it off, however it has never been released over here for reasons I cannot recall.

Nasty stuff.

Brian_M

99 posts

185 months

Sunday 12th April 2009
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I looked a buying a house that was infected with JKW, got some quotes for professional removal. For an area of about 20mx20m I was quoted £6-8000.
The soil has to be removed to a depth of 2m and taken to a specialist (in sealed trucks)for processing.
I was beaten to the purchase and it cost the buyer over £12k for the removal.
Burning is no good as the deep roots will not be affected and the weed will come back.
Nasty stuff!

treehack

997 posts

241 months

Sunday 12th April 2009
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camgear said:
My OH's parents have a honking great bit of land in there back garden that's directly backing onto an active railway line, but they've not been able to do anything with the land because it's overrun with knotweed, are the Railway responsible for clearing it? (as I recently was told), if not, what's the best way, fire?
It would depend where the JKW originated.If you can prove it came from their land then maybe you could get them to clear it or at least pay some of the costs.
It has to disposed of by a liscensed company and is not a cheap or quick process

iamrcb

607 posts

198 months

Sunday 12th April 2009
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If you're not going to build on the land, just turn it into a useable garden space then get it spray treated. It does work but it may take a good few attempts and a long wait.

MrV

2,748 posts

230 months

Sunday 12th April 2009
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Absolute nightmare with JKW it took me 3 or 4 years to clear it from my patch and I was always on a hiding to nothing as the next door neighbours had it as well

I resorted to Sodium chlorate in the end ,dosing the garden twice over the space of 6 months then covered it with plastic sheeting with some shingle on top of that to hold it in place and make it look a little less industrial.

R5GTTGAZ

7,897 posts

222 months

Sunday 12th April 2009
quotequote all
Railway will not deal with it unless its causing an operational problem such as a signal sighting obstruction.

At the minute we are chopping in and filling the stems with a red liquid (sorry not my dept)


thesilentpartner

136 posts

209 months

Sunday 12th April 2009
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Whats the red liquid ? Would be interested to know.

R5GTTGAZ

7,897 posts

222 months

Sunday 12th April 2009
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I can ask the lads at work when I get back in on Tuesday for you.


R5GTTGAZ

7,897 posts

222 months

Sunday 12th April 2009
quotequote all
The majority of Japanese Knotweed has been spread by riverbank erosion, and by mans' activities, such as flytipping garden waste and moving contaminated soil.

Some advice says to chop it then cover with something heavy like an old carpet, you have to be mega careful though as you can cause it to spread very easily.

anonymous-user

56 months

Sunday 12th April 2009
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Really nasty stuff. Whoever pays, you'll definitely need a professional.

And pesticides. fk-off strong ones, that singe your eyebrows whenever you're in the general vicinity.

pies

13,116 posts

258 months

Munter

31,319 posts

243 months

Sunday 12th April 2009
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R5GTTGAZ said:
Railway will not deal with it unless its causing an operational problem such as a signal sighting obstruction.

At the minute we are chopping in and filling the stems with a red liquid (sorry not my dept)
I've seen that on some TV show. Putting something into the stems and it helps to kill off the plant.

topsparks

1,202 posts

249 months

Sunday 12th April 2009
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I used my 3 ton digger to remove a patch at the bottom of my garden,but I must have missed a couple of bits because I have noticed it growing again!

allegro

1,149 posts

206 months

Sunday 12th April 2009
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Hate to say it but its a job for the professionals. its actualy a legal offence to plant, move or spread knotweed so dont try to cut it back. As far as i am aware the correct way of killing it off involves some pretty strong stuff which has to be applied repeatedly over the course of some time.
If railtrack dont want to know and you want rid call someone in. there are plenty of companies on tinternet.

topsparks

1,202 posts

249 months

Sunday 12th April 2009
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Only found out what it was last week!,burnt all the roots anyway.

Chrisgr31

13,529 posts

257 months

Sunday 12th April 2009
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Well it would appear you didn't burn all the roots! As stated before it either needs to be removed along with all the soil by a licenced contractor, or needs to have strongweedkiller on it for several attempts to get right down in the roots!

Simpo Two

85,883 posts

267 months

Sunday 12th April 2009
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Doesn't a translocated herbicide like gyphosate or glufosinate ammonium shift it after a few applications?

pies

13,116 posts

258 months

Monday 13th April 2009
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Simpo Two said:
Doesn't a translocated herbicide like gyphosate or glufosinate ammonium shift it after a few applications?
All in the link i posted above smile

camgear

Original Poster:

6,941 posts

196 months

Monday 13th April 2009
quotequote all
Looks like the chemicals you suggested are the best way smile

Thanks