Arundo donax is a bamboo-like giant grass, growing up to 5m. Dark green, strap-like leaves grow around the stem in an arching form. Plants spread by underground rhizomes, forming clumps. Silvery-purple plumes of flowers are borne in the autumn. Plant at the back of a sunny, border for architectural detail. Height 301cm+. Supplied in a 3-4 litre pot.