Japanese Knotweed (Fallopia japonica)

Japanese Knotweed facts:

  • Arrived in UK (South Wales) late 19th century.
  • 2 – 3m height but spreads 7m horizontally.
  • Perennial Rhizome.
  • Edible (the early shoots!).
  • Female only in UK but can Hybridise with Himalayan Knotweed.
  • Can be spread via small cut pieces.
  • Estimated to cost £1.56 billion to eradicate in UK (2007).
  • Significant issue for developers (eg Olympic grounds).
  • Can be sprayed with round up but can prove resistant.
  • Can hybridise with Himalayan Knotweed which has male flowers.

For more information on Japanese Knotweed, especially with regards homes and developments, please see here.

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