Amethyst Sea Holly

Eryngium amethystinum

Family: Apiaceae (ay-pee-AY-see-ee) (Info)
Genus: Eryngium (er-RIN-jee-um) (Info)
Species: amethystinum (am-eth-ee-STEE-num) (Info)


Alpines and Rock Gardens

Foliage Color:

Unknown - Tell us

Bloom Characteristics:

Unknown - Tell us

Water Requirements:

Drought-tolerant; suitable for xeriscaping

Where to Grow:

Unknown - Tell us


12-18 in. (30-45 cm)


12-15 in. (30-38 cm)


USDA Zone 2a: to -45.5 C (-50 F)

USDA Zone 2b: to -42.7 C (-45 F)

USDA Zone 3a: to -39.9 C (-40 F)

USDA Zone 3b: to -37.2 C (-35 F)

USDA Zone 4a: to -34.4 C (-30 F)

USDA Zone 4b: to -31.6 C (-25 F)

USDA Zone 5a: to -28.8 C (-20 F)

USDA Zone 5b: to -26.1 C (-15 F)

USDA Zone 6a: to -23.3 C (-10 F)

USDA Zone 6b: to -20.5 C (-5 F)

USDA Zone 7a: to -17.7 C (0 F)

USDA Zone 7b: to -14.9 C (5 F)

USDA Zone 8a: to -12.2 C (10 F)

USDA Zone 8b: to -9.4 C (15 F)

Sun Exposure:

Full Sun


Plant has spines or sharp edges; use extreme caution when handling

Bloom Color:


Bloom Time:

Mid Summer

Late Summer/Early Fall


Grown for foliage

Other details:

Unknown - Tell us

Soil pH requirements:

Unknown - Tell us

Patent Information:


Propagation Methods:

Unknown - Tell us

Seed Collecting:

Allow seedheads to dry on plants; remove and collect seeds

Properly cleaned, seed can be successfully stored


This plant has been said to grow in the following regions:

Auburn, Alabama

Fairport, New York

Ithaca, New York

Lakewood, Washington

Gardeners' Notes:


On Oct 23, 2004, lmelling from Ithaca, NY (Zone 5b) wrote:

Grows wonderfully in well drained soil. I started with one and now have 4 growing in their little patch after 3 years. I have successfully dug up a few young ones and given them away to friends. Use a shovel, you need to dig deep enough to get most or all of the taproot. My eryngium seem to reproduce quite well in full sun and well drained soil.

The blooms are useful in small dried arrangements. Cut in full bloom when steel blue. Let dry upside down for a week.
The hold their color for generally at least a year.


On Aug 31, 2001, Sis wrote:

Heat and cold-tolerant once established in average, well-drained soil.
No serious pests or diseases.