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Japanese knotweed, costing Britain £245M yearly, requires disclosure in property sales and is best treated in autumn despite persistent roots.
Japanese knotweed, Britain’s most costly invasive plant, has 394 verified sightings in Oxfordshire, mainly in Oxford, Banbury, and Henley-on-Thames, contributing to a £245 million annual economic impact.
Experts say household chemicals like bleach or petrol fail to kill its deep roots and may only cause temporary dormancy.
While not illegal to have on property, failing to disclose it during sales or allowing it to spread can lead to legal action.
Even after professional treatment with no visible growth, homeowners must declare it on the Law Society’s TA6 form; omission risks lawsuits.
Autumn is considered an ideal time for treatment, as the plant dies back, enabling effective long-term management.
El knotweed japonés, que cuesta a Gran Bretaña 245 millones de libras esterlinas anuales, requiere divulgación en las ventas de propiedades y es mejor tratado en otoño a pesar de las raíces persistentes.