Japanese Knotweed


This highly invasive Knotweed plant has been around in the Uk since the 19th century. Originally brought in from Japan as an ornamental plant, it has since become a very damaging and unwelcome nuisance.  Knotweed infestation has become so widespread that this plant easily damages and smothers our natural flora and fauna.  It is capeable of causing river bank erosion which in turn affects the flow of our river courses,  leading to possible flooding of surrounding areas.
Japanese knotweed is listed in the Wildlife & Countryside Act 1981 particularly England, Scotland & Wales; it is  an offence to plant this plant or otherwise cause this plant to be able to grow in the wild. It is spread by natural means such as transference by animals & wildlife; run through watercourses; rhizome & stem fragments displaced and also human transference.
It has a propensity for causing structural damage to hard surfaces including  brick work, asphalt & drains.


What is it?


  • The root consists of  rhizomes. They can penetrate to  a depth of 3m and extend to an area of aprox  7m in radius.
  • Hollow bamboo like stems
  • Stems are green with red/purple specks
  • Grow 2-3m tall creating dense clumps
  • Green heart/shield  shaped leaves
  • Leaves reaching up to  12cm in length
  • Creamy flowers on stem tips from August to October
  • Resulting seeds are sterile
  • Strain commonly found in the UK is a female only plant


What to do if you think you have Knotweed on yours or adjacent land


  • Dont panic.
  • Seek professional advice from a qualified contractor such as ourselves to deal with the problem.
  • don’t expect a quick fix.


What not to do 


  • Avoid trying to deal with this problem yourself – you run the risk of making it worse.
  • Do not flail the plant
  • Don’t try digging up the rhizome. The tiniest of fragments of the rhizome can transfer spread, the rhizome regenerates readily and will grow into new plants
  • Do not spread contaminated soil as this may contain rhizome fragments
  • Do not put knotweed through a mechanical chipper – it won’t kill the knotweed
  • Do not add to compost- you will infect the compost causing new growth when spread.
  • Do not take Japanese knotweed to green waste sites & Do not dump in the countryside
  • Remember – it is an offence to cause the spread of Japanese knotweed  – Don’t break the law


How Cherry Trees can help you:-


About us-
  • Cornish company dealing with Japanese Knotweed for 10yrs with exceptional results
  • Cherry Trees is able to help you take control of this very troublesome plant with an effective eradication programme
  • We are Cornwall Council Japanese Knotweed Approved Contractors
  • We keep up to date with the newest techniques & best practices for products and applications
  • Comply with current legislation – Japanese Knotweed Code of Practice
  • NPTC qualified operators
  • Fully insured


What we do


  1. Full initial consultation at site
  2. Tailor made management plan being site specific
  3. Chemical spraying or stem injection or combination of both using herbicides
  4. Treatment usually takes place between April – September
  5. Minimum of 2 sprays per year but preferably 3 applications per year
  6. Treatment taken over 3 years
  7. Monitoring visits


Things to Remember!


We are here to help you!
Be patient AND don’t ignore the problem.
Procrastination may result in litigation and non mortgageable property
Spraying is the most cost effective & efficient method of eradication but it does require several repeated applications over several years to be entirely effective.
The Rhizomes are able to remain viable for several years so professional involvement in this eradication is advised.


Knotweed treatment
Knotweed treatment

Knot weed after one treatment

Contact us today to see how we can help you.
tel: 01736 755306