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Environmental Consultancy specialising in Japanese Knotweed removal

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Over 20 Years’ Experience

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A+ Rated Insurance Backed Guarantee

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Scientifically Proven Solutions


Start your journey to becoming Japanese knotweed free


Need Help Identifying Japanese Knotweed?



Japanese knotweed has been identified on your residential or commercial land.


The TCM team will conduct a Site Survey and provide a Management Plan tailored to your requirements.


You engage TCM to eradicate your Japanese knotweed infestation using scientifically proven methods.


We issue our Lloyds A+ rated Insurance Backed Guarantee (IBG), so you can have full peace of mind.

Japanese knotweed growing in front of houses in London


Do you have Japanese Knotweed? Has your buyer’s mortgage been refused? TCM supply eradication solutions for homeowners.

Japanese knotweed rhizome


TCM provide science based solutions to a wide range of industries including construction, rail, road and the London Overground.

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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