Intro and Links
The sites are situated on the Cornish (western) bank of the River Tamar, 500 meters west and 700 metres north-east of O.S. Grid Ref: 452690. There were initially three growths along the river bank (map to follow).

The plant isn't difficult to find once you have an eye for it. It is usually a single stem growing straight up, distinctive leaves that are notable for their off green colour, a little bit yellow|orange

It is difficult removing the roots of Japanese Knotweed as the roots can reach a depth of 7 metres.

Each remaining piece of root or rhizome, as small as 1cm, can produce new growth.

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gov.uk :: prevention of the spread of harmful and/or invasive plants

The world's largest field trial on the control of Japanese knotweed, conducted in Wales, has found that eradicating the plant is not possible. Researchers from Swansea University . . . say . . . working with the plant's biology produces the best results.
https://www.bbc.co.uk/news/uk-wales-south-west-wales-43882916

/public_html/media/blogs/elf/img/posts/flora/jknotweed

• Original info :: old website.
• Data for years 2002 to 2010
• Data for years 2007 to 2013
• Data for years, 2012 to 2019

Legal issues and cases:

1. Network Rail Infrastructure Ltd v Williams & Anor (2018) EWCA Civ 1514

   Short version @ nearlylegal.co.uk | Long Version @ bailii.org