Japanese knotweed identifiers: 

  • green shovel shaped leaves
  • stem is bamboo like in appearance
  • produces white flowers around September or October
  • grows rapidly. 

For more help identifying it, download the NNSS Japenese Knotweed leaflet.

The potential for damage is so great it is understood that mortgage companies will not give a mortgage on a property where Japanese knotweed is present.

There is a lot of information available about controlling the weed.

Guidance on how to control and dispose of Japanese knotweed is available from GOV.UK: Prevent Japanese knotweed from spreading.

The Royal Horticultural Society website also has good information.