Sea holly (Eryngium planum) is a head turner, with its steely blue pincushion-like flower heads perched atop 80-120cm high stems. The blooms appear from around midsummer to late autumn and are long-lasting as a cut flower (fresh or dried), with fresh blooms lasting 10-12 days in the vase.
Eyrngiums are clump-forming perennials that thrive in full sun. They won’t tolerate any hint of waterlogging, so make sure your soil is free-draining. They’ll grow in most types of soil, including dry, sandy and poor soils, though plants may sprawl if the soil is overly fertile.
Look for plants at your local garden centre.