Japanese Knotweed – What you need to know

By Mark Montaldo on 21st December 2017 (updated: 19th July 2019) in News

Japanese Knotweed (Fallopia japonica), is a large, herbaceous perennial plant, native to East Asia.  In Europe, the species has successfully established in numerous habitats and is listed by the World Conservation Union as one of the world’s worst invasive species.

​The root system is highly invasive and its strong growth can damage concrete foundations, buildings, roads, paving, walls and architectural sites.

Knotweed is a frequent colonizer of temperate ecosystems, roadsides and waste ground.  It forms thick, dense colonies that completely dominate other herbaceous species.  It’s spread has been partially attributed to its tolerance of a very wide range of soil types, pH and salinity.  The underground stems can survive temperatures of −35 °C and extend up to 7 metres horizontally and 3 metres deep.  Removal by excavation is extremely difficult. The plant is also resilient to cutting, vigorously resprouting from the roots.

Mark Montaldo Knotweed Help Solicitors
Mark Montaldo

Mark Montaldo is the lead solicitor for Knotweed Help and has over 12 years of experience in the field of Civil Litigation and has advised a Parliament Select Committee on the legal issues faced by individuals dealing with Japanese knotweed on their land. Now considered one of the country's leading litigators in Japanese knotweed law he works alongside the country’s top barristers and experts. His in-depth legal experience and connections to the Japanese knotweed removal industry make him uniquely suited for handling your case.