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Replies

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  pete May 5, 2012 at 6:46pm

   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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  Andy Harrold May 5, 2012 at 10:10pm

  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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  Colin Hunt May 6, 2012 at 9:15am

  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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  David Cox May 6, 2012 at 11:50am

  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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  gary newton May 6, 2012 at 7:54pm

  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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  Jez Young May 7, 2012 at 12:05pm

  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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  Andy Harrold May 21, 2012 at 9:30am

  It appears that this little weed is causing problems in the Banking Industry -

  News Report
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  andy @Doughty Garden Maintenance May 21, 2012 at 6:58pm

  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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  pete June 3, 2012 at 11:46am

  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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  Brian Taylor June 10, 2012 at 10:11pm

  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