Reynoutria japonica - Japanese Knotweed

[TeeDee]

Reynoutria japonica - Japanese Knotweed

Has anyone experience of spotting and treating Reynoutria japonica - Japanese Knotweed?

I don't necessarily mean getting a company in to deal with it at specialised costing - but more what can one do to treat it yourself?

What over the counter chemical herbicide are best to treat it with?

Related - Anyone had issues or resistance to obtaining mortgage on a property and what caveats or treatment plans were put in place?

 

[Kadushu]

I've successfully treated it with glyphosate

 

[TLM]

I got rid of it in a fairly large area by tearing up the root system and for the next three years tearing up all shoots.

 

[Mesquite]

What over the counter chemical herbicide are best to treat it with?

I've plenty of experience in spotting it through my various jobs.

As Kadashu said glyphosate is the one herbicide that gets good results, especially when growth is just starting. For larger growth I know a lot of companies have trialed direct injection of it into the stems. The trick in getting a better result treating with herbicides is catching the plants in the first flush of growth when they're more delicate and take in whatever you use more easily.

If you try digging it up remember there's a lot of legislation in place for the disposal of the roots. You have to ensure it only goes for destruction by incineration at a permitted facility or a specialist landfill site that's permited to accept it.

 

[Toddy]

You can eat it, like rhubarb. It's quite tasty. Just pour boiling water over all the trimmings.
Other than that, I think that Mesquite and Co. have pretty much answered it.

It's known as Donkey grass and they'll eat it to death, literally. No shoot survives them.

On the whole glyphospate seems less bother

 

[TLM]

the disposal of the roots

I just left them in the sun, dried up fairly fast.

 

[Mesquite]

I just left them in the sun, dried up fairly fast.

It doesn't matter what you did in a different country.

Here in the UK the law is very strict on how the roots are disposed of, fresh or dried.

 

[Bhod]

Dig around the roots to expose them, then trim down any shoots to root level and as soon as a new shoot appears inject with Glyphosate, might take twelve months to see results but it totally eradicated a fairly large clump at a friends house.

No problems with the mortgage although it was a bargaining point to get a reduction in the sale price

 

[TeeDee]

Dig around the roots to expose them, then trim down any shoots to root level and as soon as a new shoot appears inject with Glyphosate, might take twelve months to see results but it totally eradicated a fairly large clump at a friends house.

No problems with the mortgage although it was a bargaining point to get a reduction in the sale price

Thanks

Potentially the properties are rental BTL , so I won't be 'on site' to keep an eye on them or do active ongoing work.

I was more wondering if I can find a Product and then pay the local handy man gardener to pop around every few months and treat the root ball with something unpleasant

 

[TLM]

It doesn't matter what you did in a different country.

It does if it works, legalities are a different matter.

Here in the UK the law is very strict on how the roots are disposed of, fresh or dried.

They burn quite nicely after drying for 3 months. I think ours says something like "dispose properly" without defining it.

 

[slowworm]

Do you know where the JKW has come from? I know there are strict laws on the spreading of it but in my experience no one down here seems to either be aware or care about that. If it's coming in from a neighbouring property it could be very hard to do much.

If a rental property then you may have to ensure things are done by the book and get someone with the relevant spraying tickets.

Also worth looking out for bamboo.

 

[TeeDee]

Do you know where the JKW has come from? I know there are strict laws on the spreading of it but in my experience no one down here seems to either be aware or care about that. If it's coming in from a neighbouring property it could be very hard to do much.

If a rental property then you may have to ensure things are done by the book and get someone with the relevant spraying tickets.

Also worth looking out for bamboo.

The general area has JNW as a bit of an increased ecological probability to being rife and somewhat common.

Yes I acknowledge it needs to be done legally for the purposes of mortgage broking and attending to invasive species.
Its not my 1st rodeo in these matters , the JNW is just something I need to have an understanding in terms of treatment to mitigate exposure and risk.

As full spectrum longitudinal treatment plans can be somewhat exorbitant I'm just interested in other options or experiences.

 

[HillBill]

I've successfully treated it with glyphosate

Aye, 100% Glyphosate. (both agreed, and the concentration of the chemical)

We have it local to us. My best mate works for the council and part of his job is things like this. Cant kill it off in one go. It needs cutting back to near the ground. Then Glyphosate applying to the hollow stems so its absorbed into the roots. If not, it will come back in a year or two at most.

Cut back, poison to death. Like a tree really if you properly want rid, and trees are hard to kill.