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Gardeners recruited to help spot next Japanese knotweed before it 'jumps the garden fence'
Take your smartphone for a walk if you really want to learn about plants
Hogweed can grow up to 20ft tall and cause burns and blindness - now they're marching across Britain
Day of the Toxic Triffids: Hogweed can grow up to 20ft tall and cause agonising burns and even blindness - and now they're on the march across Britain