Indigo is a shrubby, herbaceous plant that grows 1 to 2 meters high in dry and tropical places. Its leaves are small and oval-shaped, and are arranged symmetrically like the malunggay (moringa). As a legume, it is a soil-improving ground cover, and a plant that yields a wide variety of blue color for textiles. Its scientific word is Indigofera tinctoria. In different plants of the Philippines, the indigo has many local names: anil (spanish word used in many areas of the country), tagung-tagung and tagum (Visayas), taiom (Ilocano), taium (Ivatan), taiung (Pampanga), taiong taiungan and tagum (Bicol).