Australian Phalaris

A clumped or densely tufted, hairless, autumn and spring growing perennial grass of wet areas to 1.2 m tall with light blue green leaves, swollen stem bases and cylindrical compact seed heads 15-150 mm long that are composed of numerous densely packed spikelets. Each spikelet is 4-7 mm long. 
Native to the Mediterranean, it is a weed of wet disturbed areas, drains and watercourses and flowers in spring and summer.