A favorite of floral designers, sea holly (Eryngium) yields steely, thistle-like blooms that hold their color even after drying out. “Blue Glitter” produces clouds of stunning blossoms throughout summer 2′-3′ above a rosette of basal foliage. This is a stunning plant in the middle or back of a perennial border and combines nicely with Sporobolus, Stachys, Tradescantia, or Artemisia.