Japanese Knotweed

The knotweed division of Greencut Horticulture provides control and plant removal services throughout South East London and Kent. Our specialist contractors are fully trained and hold all relevant certifications utilising the most current control equipment and processes.

What is Japanese Knotweed?

Japanese Knotweed is a strong-growing, clump-forming perennial, with tall, dense annual stems. Stem growth is renewed each year from the stout, deeply-penetrating rhizomes (creeping underground stems). Japanese Knotweed was introduced from Japan in 1825 as an ornamental plant. The plant is not unattractive but its rapid annual growth and relentless spread, allows it to easily overwhelm other garden plants. Where established as a wayside weed, native plants are also aggressively over-run.


Although it does not produce seeds, knotweed can sprout from very small sections of rhizomes and, under the provisions made within the Wildlife and Countryside Act 1981, it is an offence to cause Japanese Knotweed to grow in the wild. Much of its spread is probably via topsoil movement or construction traffic.
An amendment to the Anti-social Behaviour, Crime and Policing Act 2014 includes Japanese Knotweed and other invasive non-native plants.

Chemical Control

The most cost effective method of controlling Japanese Knotweed is with a targeted application of strong herbicide over a period of time.

Effective removal can be difficult, as even small parts of the plants’ rhizome (rooting system) can harbour enough energy resource to rapidly develop into a new crop, and the use of retail weed killer is rarely effective as it can take several seasons to establish whether your efforts are successfully managing the plant.

Greencut Horticulture provide a considered approach and bespoke project plan for each site starting with the initial stage of positive identification through to the appropriate disposal of the dead plant.

Using specialist stem injection equipment, you will be able to notice an effect within two weeks of our initial application visit and, through periodic site monitoring, our goal is to have your Japanese Knotweed problem contained and controlled as soon as possible.