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About Us

Japanese knotweed flowers

TCM are Environmental Consultants who specialise in the control and eradication of invasive weeds, including Japanese knotweed, as prescribed by the UK and EU Legislation.

TCM have been at the forefront of the invasive weed eradication industry, and our strategies are scientifically proven and supported by a Lloyds A+ Insurance Backed Guarantee (IBG), that satisfies UK Mortgage Lenders.

Since inception, Howard Downer and TCM have successfully completed projects for, amongst others: the Commonwealth Games site in Scotland, Network Rail, Barratt Homes, Watkin Jones, Lovell Developments, Fairview Homes , Taylor Wimpey, CBRE, Persimmon Homes, Abbey Developments, Keepmoat Homes, Hopkins Homes, Gleeson Homes, Redrow Homes and various housing associations across the country.

We comply with national health, safety, and environmental standards. Not only do we want to ensure all our work is undertaken safely, but we want to minimise the effect that the work we do might have on the environment wherever possible.

TCM continues to be the market leader in Japanese Knotweed eradication in both the UK and the Republic of Ireland.


The life cycle and growth patterns of Japanese Knotweed start to be recognised, resulting in increased interest in this invasive weed across the country


TCM partnered with Writtle College to develop a KTP (Knowledge Transfer Partnership)


TCM complete a Soil Screen project at Wembley Stadium to eradicate a long standing Japanese Knotweed infestation


TCM were commissioned by the Olympic Delivery Authority to carry out works at the 2012 Olympic games site in East London


TCM complete the most significant project in the UK at that time by removing Japanese Knotweed from a brownfield site in Camborne, Dorset – over 160,000 of soil was screened, with the majority being able to be reused on site


TCM partner with Bath University to research evolving Japanese Knotweed eradication methods


TCM eradicate Japanese Knotweed via herbicidal methods at the Eden Project, Cornwall


TCM were commissioned to remove Japanese Knotweed and Giant Hogweed from the Commonwealth Games site in Glasgow


TCM complete a Dig and Dump removal of Japanese Knotweed project on the Scottish Borders railway


TCM were commissioned to use Dig and Dump Japanese Knotweed removal system for the London Overground at West Hampstead station, North London


Bouygues/University College Hospital, London commissioned TCM to eradicate Japanese Knotweed at the site of their new Cancer and surgery wing


TCM were commissioned by Taylor Wimpey to clear Japanese Knotweed and Himalayan Balsam at a new housing development in Wales

Howard Downer, MD of TCM Ltd


Howard Downer, AKA Dr. Knotweed, has over 20 years of experience as an Environmental Consultant and is regarded by his peers as one of the most knowledgeable people in the Japanese knotweed industry.

Follow Dr. Knotweed to hear of about the latest developments regarding Japanese knotweed and the implications of infestation.

Latest Residential Case Studies

  • Japanese knotweed growing in front garden of a London home

    Japanese knotweed – London

    Japanese knotweed was growing in the front garden of a North London property. The homeowner wanted to sell in 2017…

  • Image of a Japanese knotweed survey being undertaken

    Homeowner Wishing To Sell

    Has your mortgage been refused? TCM helped a homeowner who was wishing to sell his property but had Japanese knotweed…

Latest Commercial Case Studies

  • Japanese knotweed Soil Screening Project in Dorset

    Soil Screening Project, Dorset

    TCM soil screening project – eradicating Japanese knotweed at the site of commercial home building project Devon, UK.

  • Japanese knotweed soil screening on commercial site in Wales

    Brownfield Site, Glasgow

    Commercial soil screening project. TCM were commissioned by a Commercial company wishing to develop a brownfield site in Glasgow, Scotland.…

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