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Thread: japanese knotweed

  1. #1

    japanese knotweed

    Was walking round my area when i came across an area of about 50 sq feet fenced of like a stock dence and the sign read keep out Japanese knotweed contaminated soil do no remove so whats the problem with this stuff because the deer are eating it.

  2. #2
    Its a pain grows like wild fire and is a bugger to get rid of! I think its notifiable as well!

  3. #3
    It will regenerate from a small piece of stem or root (only mm long) and once established is very difficult to get rid of. Excavations can be 3m deep... Alternatively you have to direct inject the stems over the course of a couple or three years. It is allelopathic (the leaf mulch supresses other plant life) and there is very little in the way of native wildlife that eats it.
    The govt is currently considering the use of a biocontrol agent to rein it in.

    Seriously bad news.

    Regards

    G

    PS I have seen it grow through concrete floor slabs, tarmac and from being buried over three feet deep. This stuff and cockroaches will be left after a nuclear war :-{
    Last edited by zaitsev; 18-12-2010 at 14:11. Reason: forgetting important bits

  4. #4
    Sounds bad i was woundering why it had a fence round it (THAT MUST HAVE COST A FEW QUID) i will need to take a picture next time it also say dont remove any soil and the devil in me thought about lifting some just for the sake of it

  5. #5
    True 6pointer - a quarter inch of that white root in amongst a barrowload of inviting soil for a rockery or border - whatever - will create mayhem in a year or two. Like Rhododendron ponticum, a legacy from times when it was 'FUN' for landowners to import interesting plants with them in order to impress and have something new..
    Opinions often differ according to unknown circumstances.

  6. #6
    hi,

    the reason there is concern about this plant is two fold
    one it casts thousands of seed in and around September time which enables it to spread real fast
    the second which is more important is the oil/liquid it produces when broken damaged or rubbed against
    it cause severe reaction to skin similar to a burn blister.
    my advice is if you see it keep away from it
    25 years ago i got some on my thigh and forearm i still have the scars... be warned

    f.

  7. #7
    Quote Originally Posted by centralbeltstalker View Post
    hi,

    the reason there is concern about this plant is two fold
    one it casts thousands of seed in and around September time which enables it to spread real fast
    the second which is more important is the oil/liquid it produces when broken damaged or rubbed against
    it cause severe reaction to skin similar to a burn blister.
    my advice is if you see it keep away from it
    25 years ago i got some on my thigh and forearm i still have the scars... be warned

    f.
    Frank, I think you are confused between Japanese knotweed and Hog weed, Hog weed is the one that causes blisters to the skin.
    Both are invasive alien species that have become established in this country.

    Those of you who are in central Scotland will find both species growing on the banks of the Forth.

  8. #8
    erm,

    assumptions are correct and thanks Japanese hog weed is the nasty bugger that burns ha ha
    forget my last
    cant be right all the time ha ha

    frank

    hog weed

    japanese hogweed - Google Search

    knot weed

    japanese knotweed pictures - Google Search
    Last edited by centralbeltstalker; 18-12-2010 at 15:28. Reason: link to pictures added

  9. #9
    A subsidiary of the company I work for specialises in soil remediation and Japanese Knotweed is one that crops up a lot. As others have said, the stuff is nigh on impossible to kill and can cost thousands to clear up. Are you sure the deer are eating the knotweed? I was under the impression it was pretty much unpalatable save for the shoots in spring?!

    Alex
    Last edited by csl; 18-12-2010 at 18:57. Reason: 'seer' = 'deer'!

  10. #10
    Ive hogweed burns from over 30 years ago....stuff smarts for sure. Knotweed is a mare. I manged to get rid of a small clump by injecting but it was a long haul

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