Indigo (Indigofera tinctoria) is a shrub like plant grown in northern India for the production of indigo dye, which goes into coloring fabrics.
The leaves of the tree produce natural indigo. However, now there are many synthetic options available for coloring fabrics.
The agitation of indigo farmers for fair price is an important chapter of Indias freedom struggle against British rule in India.
The cultivation of this plant is on a gradual decline, as there are different species of plants that can give indigo dye.