Open Association of Landscape Industries
Japanese Knotweed, Could you identify it?
I've found 2 stands of Japanese Knotweed in new clients gardens over the last couple of weeks. The worrying thing is that both of these clients have had "gardeners" for years, either weekly or bi-weekly visits.
Japanese Knotweed is classified as a controlled waste, meaning that you can't transport it from where you find it unless you have a license, So it needs to be dealt with on site, either by spraying, or by digging out and burning. It can grow again from root pieces less than an inch in size, which is why at building sites where it has been found, tyres & boots have to be cleaned before staff and vehicles leave the site.
Could you identify it? - Have you seen it before.?
Here is one of the pics from my clients, - lots more on my blog, and links to the appropriate advice from the environment agency and the RHS
Tags: Identification, Japanese, Knotweed
Replies to This Discussion
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Permalink Reply by pete on -
we've found it coming up through and around a common fern - in a garden (maintenance) we've taken on last autumn - spotted it last week, four stems a foot tall - round-up gel on all leaf surfaces yesterday - am hoping to at least keep it in check...??
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PRO MemberPermalink Reply by Andy Harrold on -
The was a piece on the Beechgrove Garden TV program about it this week. Showed them injecting the cut stems wit a weed killer, the the burning of the cut shoots in the garden. Well worth a watch on BBC iPlayer.
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Permalink Reply by J S Tree & Garden Care on -
Went to a garden recently where a lady was growing the stuff near the house! She didn't see anything wrong with it even after we explained how invasive it is and what it can do to her house and the neighbouring properties. She had even taken cuttings to produce more of it...crazy. From what I have seen many contractors use broadshot and inject it over a planned period of time into each stem to attempt to kill it. Obviously there are strict guidelines in the treatment and removal of knotweed as the stuff spreads like wildfire
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Permalink Reply by Colin Hunt on -
We have come across Japanese knotweed on a number of occasions when taking over 'new' gardens.
We are treating one patch at the moment that the previous gardeners had been helpfully ignoring. It has travelled from the adjacent property and come up in the 9” gap between the boundary wall and a permanent shed. We cut it back with our tree pole pruner and have been keeping it under control with applications of Roundup. After 2 years, it is now beginning to struggle and we appear to have it under control - but I have no doubt that if we were to stop our ‘treatment’ it would be back with a vengeance.
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PRO MemberPermalink Reply by David Cox on -
I have it on my Allotment - as does many plotholders. Sadly many people dug it up, composted it and strimmed it when they first got their plots so its a pretty established problem now. It overtakes everything and some people are determined to deal with it without chemicals which means dig up, spread and cry.
I cut the stems and pour in neat Glyphosate and so far It has not spread, and is only throwing up 2 shoots this year down from about 30 last.
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Permalink Reply by gary newton on -
ive had it on building sites twice once in kings cross by the canal it was on a old pumping station which we developed into a water sports centre
it was breaking thro 13 inch solid brickwork walls
there we had to dig it out / dispose of the spoil a very costly procedure
and the second was in a school in west sussex here part of the works were put on hold due the costs of removal
on both occasions it was growing near water
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Permalink Reply by Jez Young on -
I grow persicaria polymorha a well behaved and treasured relative in my garden, some less experienced gardeners have misidentified it and accused me of growing Japanese knot-weed so correct identification is important
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PRO MemberPermalink Reply by Andy Harrold on -
It appears that this little weed is causing problems in the Banking Industry -
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PRO MemberPermalink Reply by andy@ Doughty Garden Maintenance on -
I have never seen it in the flesh, But I did familiarise myself with it and other dangerously invasive plants when I first started out.
But as I said, been lucky enough not to come across any as of yet!
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Permalink Reply by pete on
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after two paintings with a glyphosate gel pen - but I won't trust him just yet..
pete said:we've found it coming up through and around a common fern - in a garden (maintenance) we've taken on last autumn - spotted it last week, four stems a foot tall - round-up gel on all leaf surfaces yesterday - am hoping to at least keep it in check...??
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Permalink Reply by Brian Taylor on -
Japanese knotweed is often not identified in people's gardens or other plants wrongly identified as knotweed. I've come across clients whose gardeners where adamant that a plant in their garden was Japanese knotweed, when it something quite different (in one case dogwood - Cornus alba 'Sibirica') a very different plant indeed.
You can see lots of good photographs for identification purposes on our website - www.knotweed-removal.co.uk
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