Eryngium 'Sapphire Blue': A Striking Sea Holly for Summer Gardens

Looking for a real jewel to add to your perennial collection? Consider Eryngium 'Sapphire Blue', one of the most captivating hybrid forms of sea holly. From mid- to late summer, this hardy perennial produces cone-shaped flower heads ringed by steely blue bracts that catch the light beautifully. The thistle-like stems and leaves also carry a subtle blue tinge, adding to the plant's overall metallic shimmer.

Sea holly thrives in well-drained soil and positively revels in full sun—the more sun it receives, the more intense its flower color becomes. The blooms are excellent for dried arrangements, retaining their shape and color for months. 'Sapphire Blue' reaches about 28 inches tall and 18 inches wide, making it a perfect mid-border accent. Try pairing it with companions like black-eyed Susan (Rudbeckia) or Shasta daisy (Leucanthemum × superbum) for a classic summer contrast. Look for Eryngium 'Sapphire Blue' at nurseries with a strong perennial selection, or order from mail-order specialists.