Sea holly provides an invaluable architectural touch to the garden. In the border, give Eryngium companions such as purple Allium or purple basil. For striking color contrast, plant it among chartreuse Alchemilla or yellow Coreopsis . A good starter Eryngium is E. giganteum , commonly called Miss Willmott's ghost. E. giganteum has silver bracts and greenish cones, and is superb for drying.
Plants generally behave as self-seeding biennials.
Sea holly, Miss Willmott's ghost, thistle, eryngo. Good for xeriscapes. Eryngium dries well on its stalks, making it a popular cut flower.