Common Reed 

Phragmites australis

Common Reed is a tall grass species that can reach heights of up to 3.5 metres, although it typically grows to around 2 metres near Hainault Lake. The plant has large, feathery flower plumes that initially appear purplish before changing to brown. Its leaves are long and broad with a greyish-green hue. This species prefers wetland environments and areas with damp soil.