Two words which consistently strike fear into the hearts of landowners…

Japanese Knotweed!

This is why it’s essential to know how to manage the treatment and eradication of this invasive weed.

Let’s start by separating myth from reality. What is Japanese Knotweed, and what damage can it do

Japanese Knotweed is an invasive perennial weed which, though non-indigenous, is found extensively across the UK. Its fibrous rhizome root system spreads aggressively, deep out of sight and underground, and if unchecked can seriously affect your property.

In winter, Japanese Knotweed dies back, which is why site owners and even surveyors can fail to notice its presence. Come spring, however, it emerges and grows rapidly, wiping out native species as it spreads, and posing a threat to building foundations and drains. By early summer, bamboo-like stems can shoot up to over 2 metres in height.

At its most prolific, Japanese Knotweed can grow 20 cms in a day and its root system can extend several metres in all directions. What’s more, unskilled attempts to deal with it only encourage it to grow more!

Another reason it has earned such a terrifying reputation is that it is now established practice for mortgage companies to refuse to lend, and insurers to increase the premium, on a property if Japanese Knotweed is found unless an approved treatment plan has been put in place. Inevitably this makes for additional costs, time delays and pressure to resolve the problem before the transaction can proceed any further.

Fortunately, with professional expertise, Japanese Knotweed can be managed and properties protected, so its discovery need not be a cause for panic! Over the last twenty years our teams at Valley Provincial have successfully treated and controlled Japanese Knotweed on both residential and commercial sites.

The Wildlife and Countryside Act 1981 sets out landowner’s responsibilities regarding the control of Japanese Knotweed. Added to this, the Anti-social Behaviour, Crime and Policing Act of 2014 made provision for a Community Protection Notice to be issued enforcing action to control and prevent the growth of invasive species. This means that, though it isn’t illegal to have the plant on your own property, owners are responsible to prevent it encroaching on other people’s properties.

A planned approach to managing Japanese Knotweed and protecting your site

First, we arrange a site inspection as the plant can sometimes be confused with other weeds such as Russian Vine, Docks or Dogwood.

Then we select the best approach according to site conditions, whether this be the straightforward application of chemical treatments, or comprehensive excavation and removal if rapid eradication is essential for development projects.

Importantly, Valley Provincial is professionally accredited and certified to treat and manage Japanese Knotweed, and we guarantee our treatment plans with an insurance-backed warranty to give total peace of mind.


To find out more, simply get in touch.

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