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
Registered or introduced: 1997

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:

Patented

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

Regional

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

show all

Gardeners' Notes:

3
positives
1
neutral
0
negatives
RatingContent
Positive

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

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

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

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 f... read more