Echinops for buttonholes. GLOBE THISTLE part sun- partial shade.are prickly and weed=like often pulled out and confused with an invasive plant. Just get gumtree balls, spray paint blue, glue onto a skewer and call it good.
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.