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Eryngium
Sea Holly
APIACEAE / UMBELLIFERAE
Herbaceous
Perennials and Biennials
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Eryngium agavifolium |
Eryngium agavifolium |
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A genus of biennials and
perennials, some of which are evergreen, grown for their flowers,
striking foliage and habit. Eryngium are half to fully hardy. They
thrive in fertile well drained soil in a sunny location.
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| Varieties: -
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| Eryngium.
agavifolium
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Syn Eryngium bromeliifolium
of gardens
Form: Evergreen, clump forming, perennial
Height: 5ft (1.5m)
Spread: 2ft (60cm)
Leaves: Having rosettes of sword-shaped, sharply toothed, rich green leaves.
Flowers: In summer producing thistle-like, greenish-white flower heads on
branched stems.
Half Hardy
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| Eryngium.
alpinum
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Form: Clump
forming perennial
Height: 2.5-3ft (75-90cm)
Spread: 2ft
(60cm)
Leaves: Having basal rosettes of heart-shaped, deeply-toothed, glossy foliage.
Flowers: In summer stout stems of conical purplish-blue flower heads, surrounded
by blue bracts and soft spines are produced
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Eryngium.
amethystinum
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Form: Rosette forming
perennial
Height: 24in (60cm)
Spread: 24in (60cm)
Leaves: Having divided, oval, spiny, mid-green leaves.
Flowers: In summer bearing heads of small, thistle-like, blue flowers, surrounded
by dark blue bracts, on multi-branched stems.
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Eryngium. bourgatii
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Form: Clump forming
perennial
Height: 18-24in (45-60cm)
Spread: 12in (30cm)
Leaves: Having deeply-cut, grey-green leaves.
Flowers: From mid to late-summer producing heads of thistle-like, blue-green,
then lilac-blue flowers on branched wiry stems.
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Eryngium.
bromeliifolium of gardens
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See Eryngium
agavifolium |
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Eryngium. eburneum
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syn Eryngium paniculatum
Form: Evergreen arching perennial
Height: 5-6ft (1.5-2m)
Spread: 2ft (60cm)
Leaves: Has arching spiny grass like leaves
Flowers: In late summer producing heads of thistle-like green flowers with white
stamens on branching stems.
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Eryngium. giganteum
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Form: A clump forming
monocarpic perennial ~ That is to say the plant flowers once after two
to three years and then dies.
Height: 3-4ft (1-1.2m)
Spread: 2.5ft (75cm)
Leaves: Having heart shaped, mid-green basal leaves.
Summer: In late summer producing large, rounded heads of thistle like, blue
flowers, surrounded by broad spiny, silvery bracts.
Fully Hardy |
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Eryngium. maratimum
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Eryngium. x oliveriannum
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Form: An upright
perennial
Height: 2-3ft (60-90cm)
Spread: 1.5-2ft (45-60cm)
Leaves: Having basal, heart-shaped, jagged-edged, mid-green leaves.
Flowers: In late summer producing thistle-like, blue to lavender flowers
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Eryngium. paniculatum
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See Eryngium eburneum
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Eryngium. x tripartitum
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Form: Clump forming
perennial
Height: 3-4ft (90cm-1.2m)
Spread: 20in (50cm)
Leaves: Having a basal rosette of coarsely toothed, grey-green leaves.
Flowers: From Summer-Autumn conical metallic-blue flower heads, on blue flower
stems are produced.
May be cut and used in dried flower arrangements
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Eryngium. variifolium
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Form: Evergreen rosette forming perennial
Height: 18in (45cm)
Spread: 10in (25cm)
Leaves: Jagged edged, mid-green leaves, marbled with white
Flowers: In late summer produces heads of thistle-like, grey-blue flowers with a collar
of white bracts.
Hardy:
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Eryngium. x zabelii 'Violetta' |
Form: Upright perennial
Height: 30in (75cm)
Spread: 24in (60cm)
Leaves: Having rounded mid-green leaves divided into 3-5 segments
Flowers: In late summer producing loose heads of deep violet thistle-like
flowers.
Fully Hardy:
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Cultivation: -
Requires a well drained fertile soil in
a sunny aspect
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Propagation: -
Species plants should be
propagated by seed sown in autumn Selected
forms by division in spring or root cuttings in winter
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Fully Hardy
Pests & Diseases: -
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