Stanmore, Middlesex, United Kingdom

I suspect this is a Miscanthus but does anyone know what species + variety it actually is?

It grows to about 5', maybe 6' in a good year, presumably depending on the spring rain. (It's definitely shorter this year.) After it flowers in mid-June, the flower portion gradually closes up so that by end-July they're as they are in Pic 2. By mid-Aug the thin tubular stems have turned brown also. It stays like that through the winter.

• 30 Jul, 2011