A tall fast-growing Japanese plant of the dock family, with bamboo-like stems and small white flowers. It has been grown as an ornamental but tends to become an aggressive weed.
- Reynoutria japonica, family Polygonaceae
- A Forum spokesman said: ‘Whole sections of riverbanks, woodlands and hedgerows have become choked by giant hogweed and Japanese knotweed, with the main casualties native wildflowers and herbs.’
- Coun Wild, who has had complaints from residents about Japanese knotweed growing into their gardens from council land, said: ‘Over the years it has spread voraciously and is now becoming a serious problem in parts of Kirklees.’
- The taxonomy and nomenclature of Japanese knotweed have changed often over time, resulting in references to it in three genera: Polygonum, Reynoutria, and Fallopia.
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