Attractive heads provide form and interest in the border. Eryngium planum (Sea Holly) via garden.ee: This herbaceous perennial thistle has branched silvery-blue stems and and numerous small blue conical flowerheads surrounded by spiky bracts.
Looking for a fascinating addition to the garden? Then why not consider growing sea holly flowers. Sea hollies can provide unique interest. Read this article for information about growing Eryngium plants.