Different Types of Indigo Plants Polygonum

While there are different types of Indigo plants that can be used for dyeing, it is the true indigo, or the Indigofera tinctiroria, grown across India, that has been historically used for creating the best indigo dyes.

Polygonum tinctorium is the Japanese indigo variety. Was popular until the arrival of the indigofera tinctoria in Japan.