Domestic Infestations

The Ultimate Guide to surviving Japanese Knotweed

Identify it is knotweed ...!?!?

The leaves of the plant are broad an oval (shield shaped). 

  • The first signs of Japanese Knotweed growth are distinctive red and purple shoots in around March - April.
  • May-July bamboo like canes will have developed.
  • Aug-Oct the Japanese knotweed will show sprays of white flowers
  • Nov-Feb the canes will begin to die back and turn brown and woody with no leaves

Refer to our Identification section for images.


Knotweed Do's and Don'ts

  • Do fence off the area where possible to stop any accidental damage to the plant and to avoid any further spread
  • Do call in the experts at Japanese Knotweed Control on: 0845 643 1168
  • Don't damage it! – By cutting, mowing or hand pulling the Japanese Knotweed as this will damage the plant and cause further spread
  • Don't self-treat with off the shelf herbicide, this can knock the plant into dormancy and it may come back with more vigour in the future
  • Don't uproot it! as this could lead to further growth
  • Don't compost it! – A piece of rhizome (root) the size of a little finger nail can grow into a new plant
  • Don't waste time and allow it to become established – get it treated immediately by invasive weed professionals like us
  • Don't be liable!


It is an offence in the UK under the Wildlife and Countryside Act 1981 to plant or otherwise cause to grow in the wild.

Anti-social behaviour laws October 2014

Council officers or police can use community protection notices to "stop or prevent" people growing Japanese knotweed if it causes problems.


The notice can be used to require someone to control or prevent the growth of Japanese knotweed or other plants that are capable of causing serious problems to communities.


Breach of any requirement of a community protection notice, without reasonable excuse, would be a criminal offence, resulting in an on-the-spot penalty of £100 or prosecution, which could bring a £2,500 fine. Organisations could be fined up to £20,000.



  • Japanese Knotweed shoots are capable of growing through tarmac and concrete
  • A root less than 0.7g is capable of growing into a new plant and starting a new infestation
  • The plant is resilient to extreme cold and extreme heat, growing naturally on the side of volcanoes
  • Japanese Knotweed can grow up to 40mm per day during late spring/early summer
  • It is estimated that there is at least one infestation of the plant in every 10km2 in the UK
  • Japanese Knotweed infestations can spread by pieces of rhizome being transported on machinery previously used on infested building sites
  • The plant stores nutrients in a maze of far extending roots, allowing it to hibernate over winter in frozen soils, or lay dormant for up to 20 years.
  • Dead Japanese Knotweed canes can take up to 3 years to fully biodegrade
  • Japanese Knotweed was a gold medal winner at the Society of Agriculture and Horticulture at Utrecht in 1847, for the most 'interesting new ornamental plant of the year'.
  • Japanese Knotweed can cause subsidence by absorbing all the moisture in the soil in times of drought
  • In 1907, author John Murray wrote in 'The English Garden', Japanese Knotweed was "easier to plant than to get rid of" .... Quite an understatement!

Use our App

To help further identify if you have indeed got Japanese Knotweed we have developed an App, which is free to download either through your Android or Apple Store.

Once downloaded, it will allow you to take photographs and send us information about the infestation. We can then make an initial assessment and make recommendations to you. 


Site Surveys

Dealing with nature is at time challenging and every infestation has different characteristics that can affect both the cost and the effectiveness of the treatment. The health of the plant, its habitat and ecological issues all need to be assessed as well as accurately providing treatment options specific to your property and your needs is essential.  The cost of a site survey ranges from £150 to £249 depending on your location and the time needed to complete the inspection. You will receive a proposal detailing the treatment options available to you, the time it will take to successfully complete the works and more importantly the cost for the treatment works.


Treatment Options

As with our commercial business we offer a full range of treatment options depending on what your needs are:-

  • Excavation and off site removal – Instant solution but costly due to the amount of soil needed to be taken off site, the tipping cost and tax that needs to be collected.
  • Excavation and on site treatment – Allows instant access to the contaminated area, but large areas are needed to store the infested soil for future treatment by herbicide and not normally practical in domestic gardens.
  • Excavation and soil sift – Provides a quick solution and reduces the amount of waste needed to be removed from site, but large areas needed to allow the process to take place and not normally practical in confined gardens.
  • Herbicide application by stem injection – Injecting an herbicide directly into the stem of the plant is by far the most effective method of treatment in situ. It's not weather dependent and it's specific to the target species and results can be seen within 1 month.  Only suitable if left in situ to naturally allow to biodegrade into the soil structure.
  • Herbicide application by folia application – This process is reliant on the herbicide breaking down the cells within the leaf and being translocated down the canes and into the roots. This process takes between 3 to 5 years of application and is weather dependent.

Why Choose Us?

  • All our Operatives are NPTC PA1, PA06A & PA06AW
  • We are licensed waste carrier
  • Bespoke insurance underwritten by Lloyds of London including property damage cover specific for invasive weeds
  • Insurance backed warranty
  • INNSA Contractor Member

We are active members of Invasive Non-Native Specialist Association) which is a trade body focussed on improving standards in the invasive species industry.  INNSA membership demonstrates that we can meet the highest standards in the industry. We provide insurance backed guaranteed for every domestic project we undertake under £5,000.



To book your site survey and for any questions you might have, please use our online contact form or call 0845 643 1168