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How do I identify Japanese knotweed?

Japanese knotweed begins to grow in early spring and can grow in any type of soil, no matter how poor.

  • It can grow as much as 20 centimetres per day.
  • It spreads through rhizome (underground root-like stem) fragments and cut stems.
  • It produces clusters of cream flowers towards the end of July.
  • It dies back between September and November, leaving brown stems.
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