A Bit About Knotweed
Japanese knotweed, is a large, herbaceous perennial plant of the family Polygonaceae, native to Eastern Asia in Japan, China and Korea. In North America and Europe the species is very successful and has been classified as an invasive species in several countries.

Japanese knotweed has hollow stems with distinct raised nodes that give it the appearance of bamboo, though it is not closely related. While stems may reach a maximum height of 3–4 m each growing season, it is typical to see much smaller plants in places where they sprout through cracks in the pavement or are repeatedly cut down.

The leaves are broad oval with a truncated base, 7–14 cm long and 5–12 cm broad, with an entire margin. The flowers are small, cream or white, produced in erect racemes 6–15 cm long in late summer and early autumn.


How do I get rid of Japanese Knotweed?

Treatment Programmes
As each circumstance is different IWM offer a range of treatment options for guaranteed results: Below are just some of the services we can offer.

Herbicidal Treatment Programme
Our most popular method of treatment using a herbicidal application. IWM operatives will conduct a minimum of 6 visits to ensure the complete removal of Japanese Knotweed. Our operatives have over 10 years’ experience using this application method to both the commercial and private residential sectors.

Stem Injection
Using the stem Injection technology our team applies a fast acting Herbicide that kills the plant at the core. This method is used particularly in sensitive areas to eliminate the potential to damage surrounding vegetation.

Stem injection can be applied in all weathers and is particularly useful to administer near water courses. IWM’s stem injection technology can also be applies to other hollow cane species such as Giant Hogweed and Himalayan Balsam.

Instant Knotweed Removal
Need Japanese Knotweed removal immediately? Using the instant eradication method IWM staff will fully excavate the affected land, including Rhizomes. This is then removed to an environment agency approved disposal site. This method offers the customer a quick complete solution for construction companies and land development.

On Site Burial & Translocation
Using an excavator method the Japanese Knotweed can be treated and controlled in a designated area on site. This can be either above or below ground depending on the customers wishes. This gives the customer the ability to continue with works at a much quicker pace and reduce transportation costs. IWM recommend this option to our customers as part of our sustainability challenge.

Membrane
Using a geo textile membrane IWM will create a non-permeable barrier between a building or structure to ensure the containment of the infestation thus controlling the issue for treatment. This method can be particularly useful for people with boundary disputes or troublesome neighbours as well as helping planning applications.