Japanese knot weed

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mysty
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Japanese knot weed

Post by mysty » Sat Jun 08, 2019 8:13 pm

We have got it quite bad around our pond. It's been there a few years I thought it was just bamboo or something till someone said it's bad. Fecin roots go everywhere.Will post a picture on Monday.
It's all over the place in the limousin and cher.
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Re: Japanese knot weed

Post by Jaques » Sat Jun 08, 2019 8:15 pm

Sell up while you can
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Re: Japanese knot weed

Post by RobertArthur » Sat Jun 08, 2019 8:39 pm

It's much worse than bamboo: nice to look at, rather invasive and hard as concrete. Had to dig and build: concrete about 80 cm deep, topped with several layers of pierres. Japanese knot weed is much harder to manage, see one of the several times the BBC addressed this problem.

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Re: Japanese knot weed

Post by Jaques » Sun Jun 09, 2019 7:59 am

I wonder why the French don’t seem to be bothered by it yet

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Re: Japanese knot weed

Post by After the Storm » Sun Jun 09, 2019 9:03 am

Apparently there are four other kind of plants that can be easily mistaken for it. ( I googled last night).
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Re: Japanese knot weed

Post by Mike » Sun Jun 09, 2019 9:16 am

In the UK a whole industry has been built up around its eradication, the last time I had any dealings with it, (1990) the ground had to be dug until no more roots where encountered in depth or horizontally and everything had to be burned on site, a special environment licence had to be obtained to do any of this and it was monitored by an environmental officer, I have no doubt the rules/regulations have changed over the years, but it shows how seriously it was taken in the UK even back then.

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Re: Japanese knot weed

Post by RobertArthur » Sun Jun 09, 2019 11:12 am

Extremely difficult to control: several years before the local authorities decided to dig several meters deep to get rid of it, Kubota shovels etc. And then last year, back again, if nothing had happened. There is a European network of experts, joining efforts and publishing their hands-on experience. From the UK this code of practice (2013).

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Re: Japanese knot weed

Post by Noisette » Mon Jun 10, 2019 9:29 pm

Jaques wrote:
Sun Jun 09, 2019 7:59 am
I wonder why the French don’t seem to be bothered by it yet
Because they're at least 50 years behind the UK in ornamental gardening and, AFAIK, it's not edible.
Be alert.....your country needs lerts!

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Re: Japanese knot weed

Post by Noisette » Mon Jun 10, 2019 9:31 pm

And the French government is just in the process of banning one of the very few effective, systemic herbicides that knocked it back even if it didn't eradicate it :roll:
Be alert.....your country needs lerts!

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Re: Japanese knot weed

Post by mysty » Fri Jun 28, 2019 6:03 pm

I pulled a lot of this weed out when the thread started. We went back past yesterday and that's all new growth. Next week we are going after more roots. It wrecked the wall and a lot of the roots went through the wall and into the pond.
japnot2.jpg
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