The dry leaves of this plant have a subtle earthy scent that has been used in Indian cooking for centuries. The leaves are used to impart a wonderful flavor to rice dishes, curries, and in many other dishes.Dry Indigo Leaves are a dried plant material made from the leaves of the Indigo plant. It has a green to dark blue color, and has a blue to violet color when it is soaked in water. The plant material is a key ingredient in the process of making Indigo dyes. The plant has been used for dyeing textiles for thousands of years.