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In page Reynoutria japonica:

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Some home owners in the United Kingdom are unable to sell their homes if there is any evidence of knotweed on the property.[citation needed] The species is expensive to remove. It cost £70 million to eradicate knotweed from 10 acres of the London 2012 Olympic Games velodrome and aquatic centre.[6][5] Defra's Review of Non-native Species Policy states that a national eradication programme would be prohibitively expensive at £1.56 billion.[7] The Centre for Ecology and Hydrology has been using citizen science to develop a system that gives a knotweed risk rating throughout Britain.[8]