Photo by Melody

PlantFiles: Alpine Eryngo, Alpine Sea Holly
Eryngium alpinum

Family: Apiaceae (ay-pee-AY-see-ee) (Info)
Genus: Eryngium (er-RIN-jee-um) (Info)
Species: alpinum (AL-pin-um) (Info)

9 members have or want this plant for trade.


24-36 in. (60-90 cm)

15-18 in. (38-45 cm)

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

Unknown - Tell us

Bloom Color:
Medium Blue

Bloom Time:
Mid Summer
Late Summer/Early Fall


Other details:
Average Water Needs; Water regularly; do not overwater

Soil pH requirements:
6.1 to 6.5 (mildly acidic)
6.6 to 7.5 (neutral)
7.6 to 7.8 (mildly alkaline)

Patent Information:

Propagation Methods:
By dividing the rootball
From seed; direct sow outdoors in fall

Seed Collecting:
Unknown - Tell us

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1 positive
4 neutrals
No negatives

Gardeners' Notes:

Neutral pixie62560 On Jun 22, 2011, pixie62560 from South China, ME (Zone 5a) wrote:

This is a nice plant if you don't try to move it. I have had not luck removing it from my garden.

Positive pokerboy On Jun 29, 2005, pokerboy from Canberra
Australia (Zone 8b) wrote:

This is a quite unusual plant however as I am a fan of almost ALL blue flowers I quite like this plant. It is unique and most people visiting say "huh, whats that" amazed that there is such a plant. The blue colour is amazing. It is sort of a mettalic blue. Dies of in winter in my yard. Zone 8. pokerboy

Neutral spklatt On Mar 13, 2005, spklatt from Ottawa, ON (Zone 5a) wrote:

They can also be propagated by root cuttings, in the spring. This is generally thought to be easier than seeds, and less stressful for the plant than division.

Neutral gringo On Mar 4, 2002, gringo from Hampton, VA wrote:

Bract color changes to blue after flowering. Most of the seed of this plant is difficult to germinate unless fresh, otherwise cold stratify or sow outdoors in autumn, for germination in spring.

Neutral mystic On Aug 8, 2001, mystic from Ewing, KY (Zone 6a) wrote:

These unusual plants look like blue thistles.
The flowers of Alpine Sea Holly are plume-like rather than
resembling thistles. Plant them in full sun and in a
light, sandy soil. Once the plants are established they
do not like to be disturbed. The flowers may be cut for
drying when they are fully open. If faded terminal
flowers are removed the side branches will bloom.


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

South China, Maine
South Lyon, Michigan
Lansdowne, Pennsylvania
Spartanburg, South Carolina

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