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
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
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 Northfield, Illinois Peoria, Illinois Bloomfield, Iowa Beverly, Massachusetts Norton, Massachusetts Sandwich, Massachusetts Bellaire, Michigan Brentwood, New Hampshire Pinardville, New Hampshire Concord, North Carolina Geneva, Ohio Haviland, Ohio Toledo, Ohio Tulsa, Oklahoma Bunker Hill, Oregon Klamath Falls, Oregon San Antonio, Texas Barre, Vermont Eastsound, Washington Seattle, Washington Walnut Grove, Washington Lannon, Wisconsin