Henna grows in hot climates and can be found in most Middle Eastern countries such as Iran, Pakistan, Syria, Persia, Morocco, Egypt and India. We have found Indian henna to be the best for mehndi. The henna plant (Law Sonia interims) is 8 to 10 feet high and its leaves are dried and crushed to make henna powder. The natural dyeing properties found in henna are tannins. Synonyms for henna are henna, Al-Khanna, Al-henna, Jamaica Mignonette, Egyptian Privet and Smooth Law Sonia.