Photo by Melody

PlantFiles: Amethyst Sea Holly
Eryngium 'Sapphire Blue'

Family: Apiaceae (ay-pee-AY-see-ee) (Info)
Genus: Eryngium (er-RIN-jee-um) (Info)
Cultivar: Sapphire Blue
Additional cultivar information: (PP11088)
Hybridized by Ruigrok; Year of Registration or Introduction: 1997

3 vendors have this plant for sale.

6 members have or want this plant for trade.

Alpines and Rock Gardens

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:
Drought-tolerant; suitable for xeriscaping

Soil pH requirements:
Unknown - Tell us

Patent Information:

Propagation Methods:
By dividing the rootball

Seed Collecting:
N/A: plant does not set seed, flowers are sterile, or plants will not come true from seed

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There are a total of 22 photos.
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3 positives
1 neutral
No negatives

Gardeners' Notes:

Positive outdoorlover On Jun 15, 2013, outdoorlover from Enid, OK (Zone 7a) wrote:

This is the first year it has grown here and it is doing very well.

Neutral berrygirl On Mar 19, 2007, berrygirl from Braselton, GA (Zone 7b) wrote:

Medium 2-3' - Plant 18" apart. zone 5-9. Large steely blue flowers are sterile and long lasting. Even the stems are imbued with color. Deer and drought resistant.

Positive quasymoto On Aug 20, 2006, quasymoto from Bloomfield, IA (Zone 5b) wrote:

I thought I'd try the Sea Holly as it looked interesting. I am in Iowa and my husband has Rattlesnake Master and I think it adds interest along the same lines.

This is the first summer in Z5 and I am hoping it will winter over well as I really think I have found a neat plant to really add a punch of "True Blue" to an area.

Positive htop On May 7, 2005, htop from San Antonio, TX (Zone 8b) wrote:

Sea holly 'Sappire Blue' is a beautiful plant whose leaves have light colored veining. The blooms arise from a rosette and turn an interesting shade of blue as the blooms mature (must have enough sun for the blooms to gain the blue tones). The blue coloring extends to the stems as well as tints the foliage which is leathery and bristlely.The blooms start out green in May and keep intensifying in color and each bloom has a star-shaped spikey collar. The stalks and blooms, if left on the plant, even add fall and winter interest. In Zone 9, it usually is an evergreen plant.

This sea holly hybrid has the largest blooms of any sea holly and is a cross between Eryngium bourgatii and Eryngium alpinum which are both native European Sea Hollies. The blooms make excellent fresh-cut flowers for bouquets and are easily dried for long lasting flower arrangements (the bloom stalks must be dried in low light, preferably in a closet so the blue stays a deep shade). It prospers in poor well draining soil. Do not fertilize. If the soil is rich, it will grow taller than it should and the stalks become weak.

Although most sea hollies can become invasive, 'Sapphire Blue" is sterile so there is no need to worry that it will take over your garden. Producing a long taproot, it is difficult to transplant as well as divide, but it makes it a very drought tolerant plant. If the plant needs to be moved, down deeply enough to not harm the tap root. It should be dug in the fall after the foliage has died back to ground level. To propagate, it is best to take root cuttings in the spring and plant them in light well drained soil about 2 inches deep.


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

Los Angeles, California
San Leandro, California
Simi Valley, California
Peoria, Illinois
Winnetka, Illinois
Bloomfield, Iowa
Beverly, Massachusetts
Norton, Massachusetts
Sandwich, Massachusetts
Bellaire, Michigan
Exeter, New Hampshire
Manchester, New Hampshire
Concord, North Carolina
Geneva, Ohio
Haviland, Ohio
Toledo, Ohio
Enid, Oklahoma
Tulsa, Oklahoma
Coos Bay, Oregon
Klamath Falls, Oregon
San Antonio, Texas
Barre, Vermont
Eastsound, Washington
Olympia, Washington
Seattle, Washington
Vancouver, Washington
Lannon, Wisconsin

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