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Eryngium - Sea Hollies

Eryngium (Sea Holly) produce extraordinarily eye-catching, cone-like flower-heads with spiny, silvery-blue bracts that make wonderful additions to mixed borders or dried flower arrangements. The beautiful texture and unique color of this perennial plant, coupled with its long-lasting flowering, easy care and remarkable qualities as cut flowers make it a favorite of gardeners. Bees and butterflies love them too! 

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Eryngium (Sea Holly)

Attractive, Sea Holly plants (Eryngium) are striking ornamental perennials grown for their arresting, thistle-like, silvery or blue tinted flower heads adorned with a ruff of showy bracts. Blooming in summer and sometimes into fall, they are useful in rock gardens, coastal gardens and in borders where their steel blue flowers and foliage complement the vibrantly colored summer flowers.

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Eryngium alpinum 'Blue Star' (Alpine Sea Holly)

Eryngium alpinum 'Blue Star' (Alpine Sea Holly) is an herbaceous perennial with basal rosettes of heart-shaped, deeply toothed, glossy leaves. From mid-summer to early fall, sturdy leafy stems, tinged with gray blue, bear cone-shaped, thistle-like, silver-blue flower heads.

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Eryngium alpinum (Alpine Sea Holly)

Highly ornamental, Eryngium alpinum (Alpine Sea Holly) is an attractive upright perennial with basal rosettes of heart-shaped, deeply toothed, glossy leaves. From mid-summer to early fall, sturdy leafy stems, tinged with soft blue to steel blue, bear cone-shaped, thistle-like, purplish-blue flower heads.

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Eryngium amethystinum (Amethyst Sea Holly)

Extremely hardy, Eryngium amethystinum (Amethyst Sea Holly) is a compact perennial with a basal rosette of deeply cut, gray-green leaves, adorned with silver speckles and white veining. From mid to late summer, sturdy branching stems, tinged blue, bear small, thistle-like, blue-to-amethyst flower heads.

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Eryngium bourgatii 'Picos Amethyst' (Mediterranean Sea Holly)

Unlike other species, its deeply lobed, dark green foliage, which appears before the flowers, is elegantly marbled with broad silvery white veins, making it very attractive and luminous.

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Eryngium bourgatii 'Picos Blue' (Mediterranean Sea Holly)

Unlike other species, its deeply lobed, dark green foliage, which appears before the flowers, is elegantly marbled with broad silvery white veins, making it very attractive and luminous.

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Eryngium bourgatii (Mediterranean Sea Holly)

Perfect for sunny and dry locations! Eryngium bourgatii (Mediterranean Sea Holly) is a lovely addition to the garden or mixed containers for various reasons.

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Eryngium giganteum (Miss Willmott's Ghost)

With its luminous spiny collar of silvery-white bracts surrounding an egg-shaped flower head and tightly packed with flowers, initially pale green, then changing to steel-blue, Miss Willmott's Ghost (Eryngium giganteum) is quite a catch and an asset to any garden!

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Eryngium leavenworthii (False Purple Thistle)

Incredibly showy, Eryngium leavenworthii (False Purple Thistle) is a fantastic, prickly annual with a broadly branching stem clothed with deeply lobed leaves edged and tipped with stiff spines. From midsummer to early fall, royal purple, cone-shaped, thistle-like flower heads, 2.5 in. (6 cm), resembling small pineapples, are on display.

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Eryngium maritimum (Sea Holly)

Highly ornamental, Eryngium maritimum (Sea Holly) is a semi-evergreen, clump-forming perennial with rosettes of waxy, spiny, blue-gray leaves adorned with white veins. In summer, the stiff stems boast thistle-like, blue flower heads adorned with collars of spiky bracts.

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Eryngium pandanifolium (Giant Sea Holly)

One of the largest of the Eryngiums, Eryngium pandanifolium (Giant Sea Holly) is an evergreen perennial forming a bold rosette of narrowly sword-shaped, spiky-margined, arching, blue-green leaves. From mid-summer to early fall, it produces tall stems bearing towering umbels of small, tight, egg-shaped reddish-purple flower heads.

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Eryngium planum 'Blue Cap' (Flat Sea Holly)

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.

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Eryngium planum 'Blue Glitter' (Flat Sea Holly)

Eryngium Planum 'Blue Glitter' (Flat Sea Holly) is an extraordinarily eye-catching perennial with its multitude of glittering steel-blue flowers, tightly packed into egg-shaped heads, that light up the garden throughout summer.

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Eryngium planum 'Blue Hobbit' (Sea Holly)

Noted for its petite size, Eryngium planum 'Blue Hobbit' (Sea Holly) is a compact perennial boasting a profusion of spiny, egg-shaped, purplish-blue flower heads throughout the summer. They are produced on silver-blue stems and stand high above the basal rosette of deeply toothed, smooth textured leaves.

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Eryngium planum 'White Glitter' (Flat Sea Holly)

Adding stature to the perennial garden, Eryngium Planum 'White Glitter' (Flat Sea Holly) is an elegant perennial with a profusion of glistening silvery ivory flowers, tightly packed into egg-shaped heads, that light up the garden throughout summer.

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