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Old 22nd Apr 2012, 19:14
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There is no legal requirement for landowners in the UK to eradicate Japanese Knotweed, though transporting it onto adjacent land is forbidden without a licence. It is also an offence to cause it to spread.
Disposal (other than in situ) must be done at approved sites (and it's expensive to achieve - it must be buried at least five metres deep).

Allowing it to invade neighbouring land can be a civil matter. You can also be held liable for costs incurred from the spread of Knotweed into adjacent properties and for the disposal of infested soil off site during development which later leads to the spread of Knotweed onto another site.
An infringement under the Environmental Protection Act can result in enforcement action being taken by the Environment Agency which can result in an unlimited fine.

Japanese knotweed Law

Environment Agency - Japanese knotweed

Japanese knotweed law | Japanese knotweed legislation
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