Alphabetical Plant Listing

Eryngium (Sea Holly)

Eryngium alpinum, Eryngium amesthystinum, Eryingium bourgatii, Eryngium giganteum, Eryngium maritimum, Eryngium pandanifolium, Eryngium planum,eryngium variifolium, Eryngium x oliverianum, Eryngium x tripartitum, Eryngium x zabelii, Eryngium yuccifolium (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 useful in rock gardens, coastal gardens and in borders where their steel blue flowers and foliage complement the vibrantly colored summer flowers.

  • Their beautiful texture, unique color, long-lasting flowering and remarkable qualities as cut flowers make them a favorite of florists, gardeners, bees and butterflies. They are exceptionally care-free plants if they are given a well-chosen site.
  • With a trend toward drier summers, Eryngium has become even more popular. Easy to please, even in dry gardens where other border stalwarts suffer, Eryngium goes from strength to strength over the entire summer, complimenting every other plants with its silvery or metallic blue flower heads.
  • Drought tolerant, Sea Holly also handles salt spray with ease. 

Eryngium maritimum

Eryngium alpinum

Eryngium planum 'Blue Glitter'

Click here to see the Top Eryngium varieties

 

  • Easy to grow, Eryngium prefers full sun - at least 6 hours of direct sunlight per day. The sunnier the site, the more intense the blue!
  • Eryngium prefers dry, poor to moderately fertile, well-drained soils with the exception of Eryngium pandanifolium (Giant Sea Holly) which prefers moist soils.
  • Most Sea Holly species are reliably perennial in Hardiness Zones 4 - 9. Exceptionally hardy, Eryngium alpinum is perennial in Zone 2. Eryngium amethystinum and Eryngium yuccifolium are perennial in Zones 3. Not sure about your growing zone? Check here.
  • Eryngium needs winter protection and a warm site in order to allow the rosettes to overwinter successfully, otherwise these plants use up all their energy replacing foliage.
  • Eryngium is a taprooted plant that transplants poorly and is best left undisturbed once established. Select your site carefully!

Eryngium alpinum 'Blue Star'

Eryngium planum 'Blue Cap'

Eryngium x zabelli 'Jos Eijking'

Click here to compare all Eryngium varieties

 

  • Eryngium plants are relatively care-free once established.
  • Sea Holly plants do not require much watering except during long periods of drought.
  • Sea Holly plants do not require fertilization either. They may sprawl if grown in overly fertile soils.
  • Deadheading will promote additional blooming.
  • Sea Holly is popular with bees and butterflies, but not with deer and rabbits. 

Eryngium x zabelii 'Neptune's Gold'

Eryngium giganteum

Eryngium pandanifolium

Click here to find Pretty Garden Ideas with Eryngium

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.
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Guide Information

Hardiness 2 - 10
Heat Zones 1 - 12
Plant Type Perennials
Plant Family Eryngium - Sea Hollies
Exposure Full Sun
Season of Interest Summer (Early,Mid,Late)
Fall
Water Needs Low
Maintenance Low
Soil Type Chalk, Loam, Sand
Soil pH Acid, Alkaline, Neutral
Soil Drainage Well-Drained
Characteristics Dried Arrangements, Cut Flowers, Showy
Tolerance Deer, Drought, Rabbit, Dry Soil, Salt
Attracts Butterflies
Landscaping Ideas Beds and Borders
Garden Styles Coastal Garden, Gravel and Rock Garden, Informal and Cottage

By Ulrike Adam / Shutterstock, (c) Gerhard Bock, SucculentsandMore.com

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.

Guide Information

Hardiness 2 - 10
Heat Zones 1 - 12
Plant Type Perennials
Plant Family Eryngium - Sea Hollies
Exposure Full Sun
Season of Interest Summer (Early,Mid,Late)
Fall
Water Needs Low
Maintenance Low
Soil Type Chalk, Loam, Sand
Soil pH Acid, Alkaline, Neutral
Soil Drainage Well-Drained
Characteristics Dried Arrangements, Cut Flowers, Showy
Tolerance Deer, Drought, Rabbit, Dry Soil, Salt
Attracts Butterflies
Landscaping Ideas Beds and Borders
Garden Styles Coastal Garden, Gravel and Rock Garden, Informal and Cottage
Not sure which Eryngium - Sea Hollies to pick?
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