Persicaria tinctoria is a species of flowering plant in the buckwheat family. Common names include Chinese indigo, Japanese indigo and dyer's knotweed.[2][3][4] It is native to Eastern Europe and Asia.

The leaves are a source of indigo dye. It was already in use in the Western Zhou period (c. 1045–771 B.C.), and was the most important blue dye in East Asia until the arrival of Indigofera from the south.

See also

References

  1. ^ Persicaria tinctoria. The Plant List.
  2. ^ Japanese Indigo Polygonum tinctorium also called: Persicaria tinctoria
  3. ^ An Impartation of Color: Japanese Indigo (Polygonum tinctorium) – leaves
  4. ^ "Dye seeds Japanese indigo, Polygonum tinctorium". Archived from the original on 2023-06-05. Retrieved 2023-08-23. [...] Japanese indigo or dyer's knotweed is a plant that contains indigo precursors in the green leaves.

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