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Can Japanese Knotweed and Bindweed coexist?

julpskijulpski Posts: 6
We're about to buy a house and our surveyor has identified JKW in one of the neighbouring gardens. Other neighbours claim it is bindweed (and it does have large trumpet shaped flowers which clearly indicates that it is bindweed).

After showing the surveyor the clear bindweed photos, he is now convinced it is a combination of both, knotweed and bindweed. Is that possible? Can they coexist? Is it possible that the bindweed is climbing on the knotweed?

Could it be that we only see bindweed flowers now because the knotweed hasn't started flowering yet?

I'm attaching some photos.


  • punkdocpunkdoc Posts: 13,758
    It is certainly possible for them to co-exist.
    In the photos you clearly have bindweed and although not totally clear, it does look like JKW as well.
    How can you lie there and think of England
    When you don't even know who's in the team

    S.Yorkshire/Derbyshire border
  • wild edgeswild edges Posts: 9,397
    100% japanese knotweed and looking at the state of the garden and building it doesn't look like it would get treated anytime soon.
    Tradition is just peer pressure from dead people
  • rock_henrock_hen Posts: 106
    there is definately Japanese Knotweed in there
  • DovefromaboveDovefromabove Posts: 84,040
    rock_hen said:
    there is definately Japanese Knotweed in there

    Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.

  • JennyJJennyJ Posts: 8,913
    edited July 2020
    On the plus side, chemical treatment of the knotweed will knock back the bindweed as well. But personally I wouldn't touch it unless current owners get it professionally treated first. Or reduce the asking price by enough to cover proper professional treatment.
    Doncaster, South Yorkshire. Soil type: sandy, well-drained
  • julpskijulpski Posts: 6
    Thanks for the quick replies everyone! This is indeed bad news..
    We will inform all the neighbours, try to hunt down the owners of the derelict garden and speak to the council about this. 
    If anyone has successfully dealt with a situation like this, please let me know how!

  • K67K67 Posts: 2,507
    edited July 2020
    Hope you don't need a mortgage......
    Council tax is still paid on empty properties so the council should have contact information but probably wouldn't give you the details.
    Land registry will hold the title deeds and it costs about £3 to download a copy and that will have names and addresses but might not be up to date if owners have died. 
  • Hostafan1Hostafan1 Posts: 34,061
    I'd not buy a house with JKW next door
  • We had knotweed in our last garden, coming in from a neighbour's plot. We also inherited isolated pockets of knotweed on fields we bought with our current house. We had to pay for a 3 year management program of spraying a monitoring visits by a licensed firm. It was just under £5,000 for the three year term. I would say it is now trying to grow back and we'll be repeating the process.

    You definitely have knotweed and the bindweed is simply using it as a host to climb. Looking at the infestation in your photos there is no way it would be restricted to that one property. I would also be worried that its root system has gone under the flat roof extension on the left hand side in the photo.

    I am no professional but it could take years to eradicate this and (I believe) you would have to declare it on sales particulars should you sell. Treatment will have an impact on many of the neighbouring gardens as it will have undoubtedly gone under their fences and need spraying there too. SO may refuse you access, not considering it a problem. If you are really serious about the house I would be looking to knock £10-20K of the price in anticipation of the problems to come.
  • FireFire Posts: 17,116
    The neighbour might fight the surveyor's diagnosis tooth and nail as it will knock a chunk off the property price and may make it hard to ever sell.
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