There is no more versatile and indispensable herb than the indigo plant. Whether you are looking for an addition to your tea, a treatment for an ailment, or just a creative way to add a dash of color to your life, indigo is your answer. Indigofera tinctoria, also known as indigo, indigo bush, or blue dye plant, is an evergreen shrub that grows wild in India, China, and other parts of the world. The leaves of this plant are used to create a blue dye for textiles, as well as to impart the color blue in many food products.