pandan-like-leaved eryngo

E. pandanifolium is an imposing plant, forming a dense clump of large, sword-shaped, spiny-margined blue-green leaves, to 1.5m. In late summer it produces stems to 2.5m, with axillary branches for their whole length, bearing many small, round, purplish-grey flower heads, which may mature to chocolate brown if not effected by frost