It grows in dense clumps , usually about 2 metres ( 6 ft 7 in ) high ( although they can be much taller ) , on wet coastal land .
Is a dominant feature of much of the landscape .
It grows in dense clumps , usually about 2 metres ( 6 ft 7 in ) high ( although they can be much taller ) , on wet coastal land and is a dominant feature of much of the landscape .