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Hairyloon

Japanese Knotweed

Credit where it is due, it must be locking up a fair amount of carbon.

I am currently on a tea break from trying to rescue a garden from this stuff. In many ways, it is an impressive plant.

But how to rid?
Best ways anyone?
Repeated applications of strong weedkiller?
I've heard that you should let it grow to 5 leaves, then pull it up, and keep repeating, which I could do if I lived here, but I am just passing through so to speak.

I have done work on an infested site and their decontamination procedure was nearly as extreme as they used for foot and mouth. I suspect that was overkill, but I'm open to suggestions on how much I should worry on that score.

I also think there must be something useful to do with the damn stuff. Someone said you can cook it as rhubarb, but there is just too much.

Maybe just dry it out as a carbon sink?
towerhill

Strim it. Then inject glysophate directly into the stumps. Repeat for about 20 years. It will eventually die.
Jamanda

Once it is established, I think it is almost a scorched earth type procedure to get rid.

On the Commons I help look after we get it popping up every so often. We let it get to about 4foot tall then paint the leaves with Round Up. This seems to be keeping it under control. I've also seen people dealing with more established stuff by cutting and injecting the weedkiller into the stump.

Every part of the plant is capable of sprouting a new plant if it is left to take root, so be very careful to remove or destroy all traces.
towerhill

towerhill wrote:
Strim it. Then inject glysophate directly into the stumps. Repeat for about 20 years. It will eventually die.


I forgot - after strimming spray the whole area with diesel and light.
cab

Jamanda wrote:
Once it is established, I think it is almost a scorched earth type procedure to get rid.


If only scorching the earth worked...

Its a dreadful thing to be rid of. I've managed to wipe a small patch out with sodium perchlorate weedkiller once, although nowt else would grow there for a good while afterwards. Glyphosate, repeatedly and harshly, can work, and I believe that hitting it in later summer before the stems and leaves start to dry up can increase the impact. Direct injection might be better, some say that it is.
Hairyloon

towerhill wrote:
Strim it. Then inject glysophate directly into the stumps. Repeat for about 20 years. It will eventually die.

I had understood that strimming is about the worst thing you can do, because it can grow from the tiniest part.
Strimming breaks it into tiny parts and broadly distributes them.

Besides, they are tough stems so it would be hard work on the strimmer and most of them pull up easier than that.
Green Rosie

You can always eat it - recipe link here
Pilsbury

along the same lines, who do I report it to once I find it? whilst walkig through one of the tiny council run oasis of green at the end of my road I noticed a single stem of it about 5ft high so who do i need to tell, the council, the enviroment agency of someone else.
cab

Pilsbury wrote:
along the same lines, who do I report it to once I find it? whilst walkig through one of the tiny council run oasis of green at the end of my road I noticed a single stem of it about 5ft high so who do i need to tell, the council, the enviroment agency of someone else.


The land owner should be your first port of call, but I've had such trouble gettng our local authority here to deal wth such things... Good luck!
Pilsbury

cheers but the council is the land owner, I will see if I can contact the parks dept that is suppost to look after them.
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