HGTVGardens Crew

Sea Holly
Sea holly features blue green stems with masses of small metallic blue flower heads. It's a delight to butterflies and flower arrangers alike.

Sea holly (Eryngium x tripartitum) can grow to a height of 32 inches and spread 20 inches. This perennial prefers full sun and well-drained soil. Its cone-like purple bloom heads appear in mid to late summer and attract butterflies. Consider for your rock garden or as a specimen plant.


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