The giant reed (Arundo donax) belongs to Poaceae (the Grass family). It is an evergreen perennial herb that is distributed westward from Kanto district of Honshu to Shikoku, Kyushu of Japan, also Taiwan, China, India to the Mediterranean region. This herb grows in warm maritime or stream banks, and can reach 2-4 m in height. The rhizomatous roots are elongated in the ground and form large clumps. The leaves are linear, thick and arranged in alternate. The magenta tinged spikes are borne in the panicles from August to November. The leaves are used as a livestock feed.