Find out what problems it causes, what it looks like and how to remove it from your property.
What problems does it cause?
Japanese Knotweed is the most invasive species of plant in Britain and it spreads extremely quickly, preventing native vegetation from growing.
It is a problem to the construction industry as it is capable of exposing weaknesses in buildings, foundations, concrete and tarmac.
What does it look like?
- It is lush green in colour
- The leaves are heart shaped
- The stem is bamboo like in appearance
- It produces white flowers around September or October
- It can grow by 10cm a day
- The stem can reach three metres high and can move up to seven metres away from the plant
What to do if you find Japanese Knotweed on your premises
Landowners are not legally obliged to remove Japanese Knotweed, unless it is causing a nuisance to neighbouring property. However it is an offence to plant, or cause Japanese Knotweed to grow, in the wild.
All parts of the plant and any soil contaminated with it are classed as controlled waste, so you need to dispose of it carefully to make sure it does not spread. If you are using a contractor to remove the waste for you, they must be registered with us as a waste carrier.
To find a contractor to remove Japanese Knotweed, and other invasive plants, please search the Waste Directory:
The documents below will tell you how to manage, control and dispose of Japanese Knotweed. For more information or advice please contact us by email at enquiries@environment-agency.gov.uk or by phone on 08708 506 506.
