Identification confirmed by Paul Green
Branched flowerheads with silky, one-flowered spikelets. Pointed broad, flat leaves with rough edges, ligules short and blunt. Leaves persist through the winter. Height 100-180cm.
Found where water levels fluctuate in ditches and at the margins of ponds, lakes and canals, can tolerate drier conditions in summer. Widespread throughout Ireland.
Similar: Common Reed, Phragmites australis