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Persicaria tinctoria
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Order:	Caryophyllales
Family:	Polygonaceae
Genus:	Persicaria
Species:	P. tinctoria
Binomial name
Persicaria tinctoria (Aiton) Spach 1841
Synonyms
Polygonum tinctorium Aiton 1789 Ampelygonum tinctorium (Aiton) Steud. Persicaria tinctoria (Aiton) H. Gross Pogalis tinctoria (Aiton) Raf.

Persicaria tinctoria is a species of flowering plant in the buckwheat family. Common names include Chinese indigo, Japanese indigo and dyer's knotweed. 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 BC – 771 BC), and was the most important blue dye in East Asia until the arrival of Indigofera from the south.

See also

• Indigofera tinctoria

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.

Gallery

• Traditional natural dyeing (Korean blue)

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