Below you will find some of the most frequently asked questions we receive relating to Japanese knotweed, other invasive weeds and the services we offer.  If you have a question that has not been addressed below then please contact us via the Ask a Question form in the sidebar and one of the team will respond to you. 

  • What is Japanese knotweed?

  • What does Japanese knotweed look like?

  • Is Japanese knotweed poisonous?

  • How does Japanese knotweed spread?

  • I have Japanese knotweed on my land – can I mow it?

  • Can I kill Japanese knotweed myself?

  • How can you kill Japanese knotweed?

  • What should I do if my neighbour has Japanese knotweed close to my boundary?

  • What guarantees do TCM offer?

  • How long does it take to eradicate Japanese knotweed?

  • Can Japanese knotweed grow through concrete, tarmac and foundations?

  • Is it illegal to have Japanese knotweed on your land?

  • What geographical areas do TCM cover?

Ask a Question

Howard Downer


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 about the latest developments regarding Japanese knotweed and the implications of infestation.

Latest Residential Case Studies

Latest Commercial Case Studies

Soil screening project, Dorset  

Soil screening project, Dorset

Commercial property developers commissioned Total Conservation Management to remove Japanese knotweed from site in Dorset.

Brownfield site, Glasgow  

Brownfield site, Glasgow

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

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