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Page last updated at 08:44 GMT, Friday, 10 October 2008 09:44 UK

Superweed's astonishing growth

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The rapid spread of Japanese knotweed is causing huge problems across the UK.

This timelapse footage reveals the superweed grew more than 1m-tall (3ft) in just three weeks.

Scientists want to introduce a plant-eating predator from Japan to the UK to control the plant.

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