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Rhu and Shandon Community Council

Japanese Knotweed Facts

This page provides factual information about Japanese Knotweed

Argyll and Bute have information on their website about knotweed and other invasive species.

 In 2018 they revised their policy  on dealing with these


This weed, imported as a garden plant in Victorian times, is spreading fast in our area.

  •  it is lush green in colour
  • has shovel shaped leaves
  • has a stem that's bamboo like in appearance
  • produces white flowers around September or October
  • It can grow  1 metre in a month
  • In August /September the growth is very lush and you can see why our Victorian ancestors thought it was an asset
  • A single stem is definitive
  •  It can regenerate from a small fragment and has very deep strong roots which can damage foundations. 
  • It can affect house sales
  • You must not strim or cut it, unless you can burn it immediately in situ.
  • It has creamy flowers in September or October.
  • Native plants are suppressed and, after a couple of years, it can be the only plant left standing. This is a winter view of what was originally a mixed hedge. The hollow stems look rather like bamboo. They remain throughout  the winter.

There was a item on the Today programme on Radio 4 on 17th November 2014 on Japanese knotweed.

Follow this link to read the text and to see an informative video. People who fail to control the spread of the weed in England can be fined or receive an anti-social behavior order(Asbos). Can't help feeling that this is inappropriate!


In 29th September 2014,  the EU  adopted a new Regulation on invasive species. 


        The Regulation is a binding legal tool and comes into force on 1 January 2015. This is a significant step in the battle against knotweed.

If you would like to be involved in the Task Force or just be kept informed of our progress, let us know via the FEEDBACK page on this website.