Poa tussock (tussock grass)
Poa labillardierei

Coarse, densely  tufted, yearlong green, perennial grass to 120 cm high
Stems round,  roughened below seedhea
Leaves to 80 cm  long and 3.5mm wide, rough on the lower surface and dull green or greyish green  in colour
Seedhead is an open  panicle to 25cm long, with erect or loosely spreading branches.  Florets are shortly hairy and often have a  pinkish tinge
Flowers most of the  year