Agaru (Aquillaria Agallocha) – Ayurvedic Properties, Part Used & Dosage Description of the Plant This is a big tree growing up to 60 to 80 feet and with thick stem of 3 to 4 ft in diameter. It is native to South East Asia. The bark is papery thin and was sometimes used for writing like Betula utilis tree bark (Bhojpatra in Sanskrit). Leaves are thin like leather, shiny and up to 3 inches long. Flowers are white in color