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A blooming specimen of this sea holly is a sight to behold. Very ornamental steely-blue-purple thistle-like flowers on 2-3' stems have a pretty and spiny ruff — the floral equivalent of excitement. Clumping perennial. Eryngiums are incredibly hardy, grow in hot and dry conditions happily and do well in coastal areas.
Mature Size: 24-36 in T x 24 in WMinimum temperature: -35° F