Japanese Knotweed: How to eradicate and dispose of the invasive plant


    Due to the fast-growing weed being classified as controlled waste, there are a range of factors which should be considered before disposing of the destructive plant. The Royal Horticultural Society has offered some helpful advice to ensure the prolific weed is eradicated.

    Once the Japanese knotweed has been treated with a herbicide, it is common to see regrowth of around 50 to 90 centimetres during the following spring, which will then require further treatment.

    When applying weedkiller, care should be taken to prevent spraying surrounding plants.

    Professional contractors can be appointed to tackle Japanese Knotweed. 

    They use stronger weedkillers, which can eliminate the weeds more quickly.

    When selling a property, it is the duty of the homeowner to declare the presence of Japanese Knotweed on a TA6 form, which provides a buyer with key information about a property. 

    The homeowner will be required to set out details of a management plan aimed at eradicating the invasive plant.

    Mortgage lenders acting on behalf of property buyers will request proof that action has been taken to eliminate the weed.

    To help others in identifying Japanese Knotweed, pictures of the invasive plant can be sent online to the RHS.


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