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Index of Subjects
Index of Subjects Quote from Gardening Life pub: This escaped ornamental is even worse than goutweed (Aegopodium podagraria). Classed as a noxious weed in many provinces, Japanese knotweed (Polygonum cuspidatum) has shoots that can penetrate asphalt. Chop it back to the ground, then cover the area with a layer of heavy black plastic held down with bricks. Leave for several weeks in the sun to fry the remnants beneath. Then cover the whole lot with dampened newspaper and another layer of black plastic. This is a tough plant and it will take a while to get rid of it cheaply. The alternative is to dig it out with a backhoe. I'd go with the plastic
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