Definition of Japanese knotweed in English:

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Japanese knotweed

noun

[mass noun]
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
Example sentences
  • 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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