Arundo donax 'Macrophylla'
Giant reed. A truly gigantic thing, forming big clumps of blue-green towering foliage to 3m+ high. This is the wider leaved form, good for even more exotic effect, with leaves as wide as a good belt, with long tapering tips. Looks great as a backdrop, or even as a frontdrop if you like that sort of thing. Any ordinary soil in full sun.