Japanese Knotweed

Spencer is widely recognised as a specialist in the clearance, treatment and control of Japanese Knotweed, so much so, we are often asked to lecture on the subject!

Japanese Knotweed is easily Britain’s most invasive plant, spreading relentlessly and destroying ecosystems by catastrophically overwhelming other plants. But it can also damage roads and buildings by growing through tarmac, concrete, walls and floors.

The main reason Japanese Knotweed is so difficult to eradicate is because its roots can stretch over 7 meters from the parent plant and grow to a depth of 3 meters. And, because a new plant can grow from just a fragment of root, the effective management of it must be put in the hands of experts - like us.

According to The Wildlife and Countryside Act 1981 which provides the primary controls on the release of non-native species into the wild in Great Britain, it is an offence under section 14(2) of the Act to ‘plant or otherwise cause to grow in the wild’ any plant listed in Schedule 9, Part II. This includes Japanese Knotweed.

Because there is no easy way to get rid of these plants, it is important to instigate a management plan for control and disposal, which is where Spencer can help.

Spencer is highly experienced in dealing with invasive plant species’ and works regularly with major clients in the construction, highways and civil sectors. It also works closely with local authorities and organisations, right from the commissioning of a site, through to project completion. This often involves ongoing land management to ensure if there any sign of Japanese Knotweed returning, the growth is spotted and dealt with effectively.

Spencer is also experienced in surveying, controlling and managing other invasive plants such as: Giant Hogweed, Himalayan Balsam, Ragwort and Rhododendron.

• Site Clearance
• Groundworks