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What is Japanese Knotweed?

An Introduction to Japanese Knotweed

Japanese knotweed is the most invasive alien species in Britain. It was first introduced to this country from Japan in the middle of the 19th Century. Nowadays, it is commonly found on brownfield and wasteland sites where its presence can add hundreds of thousands or even millions of pounds to site costs.

Japanese knotweed exhibits vigorous growth through the soil from a fibrous rhizome (creeping root system) that can cause damage to areas of hard standing, foundations, drains, services, walls and other built structures by growing through cracks and openings between them. Soil can be contaminated with reproductive knotweed material up to a depth of 3m and a radius of over 7m. The Environment Agency recommends the removal and/or treatment of all soil within these extents.

If it is not dealt with before a site is redeveloped, or if groundworks take place for another reason, Japanese knotweed contaminated material can very easily be spread across or off a site, resulting in new areas of knotweed growth and, potentially, criminal prosecution or litigation from third parties. This is because from only a small amount (less than a centimetre) of knotweed root (rhizome), regeneration can occur forming a new, viable plant. If you are looking to identify Japanese knotweed, we have a range of resources as well as a dedicated identification service that can help. Feel free to send us a picture for your free assessment.

Phlorum Limited listens to all our clients’ needs and provides a package that will usually result in at least a 50% saving in costs associated with conventional Japanese knotweed eradication works. We can then go further to reduce waste volumes and landfill expenses by minimizing the amount of material that needs to be taken off site or by providing a complete onsite Japanese knotweed treatment solution.

Data sheet

How can it be treated?

Phlorum Limited was founded on specialist Japanese knotweed eradication services drawing from our wide ranging environmental impact assessment and management experience. We provide bespoke Japanese knotweed solutions that often combine with our service provisions in contaminated land, environmental auditing and ecological survey work.

We have significant experience with Japanese knotweed on both domestic and commercial properties and have published scientific research papers in peer-reviewed journals and selected trade press. We have cleared Japanese knotweed from over 1,000 sites for an impressive range of well-respected clients. All our staff are highly trained and qualified. Our Japanese knotweed eradication work is backed by a range of bonded warranty options and professional indemnity insurance.

If you are worried that you have a case of Japanese knotweed on your property, please feel free to send us a picture for your free assessment. Alternatively you can contact us today to speak directly to one of our expert Japanese knotweed specialists.