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Eryngium pandanifolium (Giant Sea Holly)

Giant Sea Holly

AGM Award
Eryngium pandanifolium, Giant Sea Holly, Giant Eryngo, Purple flowers, Purple perennials
Eryngium pandanifolium, Giant Sea Holly, Giant Eryngo, Purple flowers, Purple perennials

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. They may turn chocolate brown if not damaged by frost. Attractive to bees and butterflies but deer resistant, this fast-growing and imposing Sea Holly adds a dramatic architectural presence in the garden.

  • Recipient of the prestigious Award of Garden Merit of the Royal Horticultural Society.
  • Grows in clumps of stiffly erect, branched stems up to 7-8 ft. tall (210-240 cm) and 4-5 ft. wide (120-150 cm)
  • Performs best in full sun in moist, well-drained soils. Best situated in a sheltered site where it has some protection from the prevailing winds.
  • Excellent choice for beds and borders, cottage gardens and coastal gardens. May be planted as a single specimen or in groupings.
  • Cut back old flowering stems after they have finished
  • Watch for leaf and bud eelworms, powdery mildew and root rot.
  • Propagate by seed sown in containers in a cold frame as soon as ripe. Divide clumps in spring, although they may be slow to re-establish, or take root cuttings in late winter
  • Propagate by root cuttings in late winter
  • Native to South America

Learn How To Plant, Care, and Grow Spectacular Sea Holly (Eryngium)


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 exceptionally care-free plants if they are given a well-chosen site. Here are some basic rules that need to be followed to enjoy their splendid flowers.

Requirements

Hardiness 9 - 10
Heat Zones 9 - 12
Plant Type Perennials
Plant Family Apiaceae
Genus Eryngium
Common names Sea Holly
Exposure Full Sun
Season of Interest Summer (Mid, Late)
Fall
Height 7' - 8'
(210cm - 240cm)
Spread 4' - 5'
(120cm - 150cm)
Spacing 60" (150cm)
Maintenance Low
Water Needs Average
Soil Type Chalk, Loam, Sand
Soil pH Acid, Alkaline, Neutral
Soil Drainage Moist but Well-Drained, Well-Drained
Characteristics Plant of Merit, Showy, Evergreen
Tolerance Deer, Salt
Attracts Bees, Birds, Butterflies
Garden Uses Beds And Borders
Garden Styles Coastal Garden, City and Courtyard, Informal and Cottage
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Eryngium (Sea Holly)
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Alternative Plants to Consider

Eryngium leavenworthii (False Purple Thistle)
Eryngium alpinum ‘Blue Star’ (Alpine Sea Holly)
Eryngium planum ‘Blue Cap’ (Flat Sea Holly)
Eryngium alpinum (Alpine Sea Holly)
Eryngium x tripartitum (Tripartite Sea Holly)
Eryngium amethystinum (Amethyst Sea Holly)

Recommended Companion Plants

Deschampsia cespitosa (Tufted Hair Grass)
Verbena bonariensis (Tall Verbena)

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Eryngium (Sea Holly)
Eryngium bourgatii (Mediterranean Sea Holly)
Eryngium planum (Flat Sea Holly)
Learn How To Plant, Care, and Grow Spectacular Sea Holly (Eryngium)
While every effort has been made to describe these plants accurately, please keep in mind that height, bloom time, and color may differ in various climates. The description of these plants has been written based on numerous outside resources.
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Requirements

Hardiness 9 - 10
Heat Zones 9 - 12
Plant Type Perennials
Plant Family Apiaceae
Genus Eryngium
Common names Sea Holly
Exposure Full Sun
Season of Interest Summer (Mid, Late)
Fall
Height 7' - 8'
(210cm - 240cm)
Spread 4' - 5'
(120cm - 150cm)
Spacing 60" (150cm)
Maintenance Low
Water Needs Average
Soil Type Chalk, Loam, Sand
Soil pH Acid, Alkaline, Neutral
Soil Drainage Moist but Well-Drained, Well-Drained
Characteristics Plant of Merit, Showy, Evergreen
Tolerance Deer, Salt
Attracts Bees, Birds, Butterflies
Garden Uses Beds And Borders
Garden Styles Coastal Garden, City and Courtyard, Informal and Cottage
How Many Plants
Do I Need?
Explore Great Plant Combination Ideas
Eryngium (Sea Holly)
Not sure which Eryngium (Sea Holly) to pick?
Compare Now

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