Japanese Knotweed FAQs
Why is Japanese knotweed a problem?
Japanese knotweed can spread from tiny fragments – a piece of root as small as 0.7g has the potential to grow into a new plant. In theory, most parts of the plant above ground could also potentially regenerate, but the risk is much higher with the parts of the plant closest to the ground.
Japanese knotweed is very hard to kill. Herbicide treatments can take up to five years. The plant has the potential to remain dormant for twenty years, and to grow back when the roots (called the “rhizome”) are disturbed.
Japanese knotweed grows very fast – in peak times, Japanese knotweed can grow up to ten centimetres per day!
Japanese knotweed is also covered by legislation which makes it an offence to dispose of the plant inappropriately.
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