Eryngium Planum 'Blue Cap' (Flat Sea Holly) is a clump-forming perennial with a profusion of small, steel-blue flowers, tightly packed into egg-shaped heads, that light up the garden throughout summer. Each flower is adorned with a spiky collar of narrow bracts. They are produced on silver-blue stems and stand high above the basal rosette of blue-tinged, deeply toothed, smooth textured leaves. Its beautiful texture, unique color, long-lasting flowering, easy care, and remarkable qualities as cut flowers make it a favorite of florists, gardeners, bees, and butterflies. Eryngium planum is one of the hardiest sea hollies, and it has proven to be a reliable, long-lived perennial.
Height: 2 - 3'
Spread: 1 - 2'
Spacing: 18 - 24"
Exposure: Full Sun (6+ Hours)
Blooms: Spring through Late Summer