Japanese Knotweed

[FutureFarmer]

Anyone here had dealings with this weed?

How did you fix it?

 

[Kidds]

Inject 50% glyphosate into the stem cavity.

 

[Still Farming]

Inject 50% glyphosate into the stem cavity.

And still comes back.

 

[marco]

Forefront T is supposed to do the job. Councils won't/can't use it due to label recommendation about use next to water coarses. Whereas roundup can be used. If there are no water coarses nearby use some and let us know how you got on.

 

[super4]

Sprayed some with forefront t this spring. Looking good so far.

 

[nick...]

Have dug up roots and burnt it but it’s a mind numbing job
Nick...

 

[Smith31]

Diesel and bleach?

 

[Dman2]

Roundup shifted ours

 

[deleted user 837354]

Repeat applications of roundup are supposed to work, spray or stem injection but that is only what I have been told.

 

[david]

Tordon (picloram) if you can still get it ?

 

[Still Farming]

Don't know how Councils get away with pouring neat chemical into it and leave it ,in public areas ?

 

[essexpete]

Have dug up roots and burnt it but it’s a mind numbing job
Nick...

Son has been on a site where they were down 2m following roots.

 

[Farfrae]

I had a patch in a gap in a roadside hedge.

Repeated sprays with glyphosate over several years have now reduced it to the odd small shoot regrowing. I did try injecting stems to start but not sure if that was any better than spraying. Some say it best left until July before spraying; personally I find it impossible to leave alone when I see the odd stray leaf appearing so I just zap them with a garden sprayer that I keep handy.

As I say very little left and not as bad as people say but you MUST keep at it year after year; one dose won't do it.

 

[Kidds]

Roundup shifted ours

And mine.

 

[pycoed]

It's not plutonium! Sheep will graze it down, as will pigs. Pigs will also root up the woody boles & eat all the succulent roots. Collect all the woody bits after the pigs have done the work & burn them (not the pigs, well not until later anyway). Move the pigs & wait a bit. If any regrowth occurs (didn't for me) spray with roundup when small. Finito .
If you can't pen pigs on it, then you'll have to do the work & it'll take a year or three of respraying to fix. You may find the odd bit coming through several years later, but that's easily sprayed off or dug up.

 

[Tarw Coch]

As said above, persistence over time is needed, Pastor will kill it but it will be back next year, it’s not something that can be got rid of easily, you have to keep at it.

 

[Redfish]

Spray it with Glyphosate in September, be really thorough and get coverage of the plant,follow label recommendations and you should control 90%+ from the first treatment.
It will take a few years to get complete control but a single treatment with Glyphosate in late summer/autumn does work.
If its growing on a site to be developed remember the rhizome could remain viable for a considerable period after successful herbicide treatment.

 

[devonboy]

knotweed should be sprayed after it has flowered, as it grows so fast it doesnt take the spray in until after flowering, it then sends nutrients etc back to the rhizomes for next year so if you spray it then it will work, yes glyphosate works fairly well, but glyphosate with grazon is so much better

 

[davidroberts30]

Forefront t

 

[Kidds]

If its growing on a site to be developed

If it is growing where you want to develop you need to get rid of it well in advance. It is treated as a very serious issue especially by mortgage companies.

Why have you got big clumps that are difficult to control anyway? They should have been dealt with when first noticed.