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)

Category:

Alpines and Rock Gardens

Height:

12-18 in. (30-45 cm)

Spacing:

12-15 in. (30-38 cm)

Hardiness:

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

Danger:

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

Bloom Color:

Blue-Violet

Bloom Time:

Mid Summer

Late Summer/Early Fall

Foliage:

Grown for foliage

Other details:

Drought-tolerant; suitable for xeriscaping

Soil pH requirements:

Unknown - Tell us

Patent Information:

Non-patented

Propagation Methods:

Unknown - Tell us

Seed Collecting:

Allow seedheads to dry on plants; remove and collect seeds

Properly cleaned, seed can be successfully stored

Regional

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

Auburn, Alabama

Fairport, New York

Ithaca, New York

Lakewood, Washington

Gardeners' Notes:

1
positive
1
neutral
0
negatives
RatingContent
Positive

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.

Neutral

On Aug 31, 2001, Sis wrote:

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