Tall Bearded Iris 'Sea Power'


Family: Iridaceae (eye-rid-AY-see-ee) (Info)
Genus: Iris (EYE-ris) (Info)
Cultivar: Sea Power
Hybridized by Keppel
Registered or introduced: 1998
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Tall Bearded (TB)


36-48 in. (90-120 cm)


12-15 in. (30-38 cm)

15-18 in. (38-45 cm)

18-24 in. (45-60 cm)


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


Parts of plant are poisonous if ingested

Handling plant may cause skin irritation or allergic reaction

Bloom Color:

Light Blue

Medium Blue

Bloom Time:

Midseason (M)



Other details:

Unknown - Tell us

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 rhizomes, tubers, corms or bulbs (including offsets)

Seed Collecting:

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

Awards (if applicable):

Honorable Mention

Award of Merit

Dykes Memorial Medal

John C. Wister Memorial Medal (TB)

Foliage Color:

Unknown - Tell us

Bloom Characteristics:

Flowers are fragrant

Water Requirements:

Average Water Needs; Water regularly; do not overwater

Where to Grow:

Unknown - Tell us


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

Bakersfield, California

San Jose, California

Stanford, California

Gainesville, Georgia

Macy, Indiana

Hebron, Kentucky

Gardiner, Maine

Blanchard, Michigan

Chelsea, Michigan

Robertsville, Missouri

Beatrice, Nebraska

Omaha, Nebraska

Los Alamos, New Mexico

Sayville, New York

Coshocton, Ohio

Lawton, Oklahoma

Grants Pass, Oregon

West Newton, Pennsylvania

Myrtle Beach, South Carolina

Greeneville, Tennessee

Corsicana, Texas

Harker Heights, Texas

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Gardeners' Notes:


On May 29, 2010, KSBaptisia from Beatrice, NE (Zone 5b) wrote:

Not the most vigorous grower, but it is easily the prettiest medium blue iris I've grown (or seen).


On Jan 17, 2008, pajaritomt from Los Alamos, NM (Zone 5a) wrote:

Planted it in 2006, it bloomed beautifully in 2007. I can't wait to see it in 2008. Magnificent iris that seems perfectly adapted to our 5a, dry, cool climate.


On Feb 6, 2007, Tntigger from Greeneville, TN (Zone 6b) wrote:

Beautiful iris, growth is normal here in zone 6b.


On Jun 30, 2006, MikenMyrtle from Myrtle Beach, SC wrote:

I saw a picture of Sea Power three years ago and wondered if it could be as beautiful as that particular photograph. It bloomed for me this spring, and my assessment is "yes." The color of the flower often didn't come out as deeply blue in several of my photos of it, but in real life it really is this pretty.

I would add, however, that it is not a terribly fast grower here, though this is stated very honestly by Keith Keppel, the hybridizer, in his description--he states that it takes a little time for it to get established, but it is worth the wait. I agree!

Sea Power was the top Wister Medalist in 05, and has been announced as the 2006 Dykes Medal winner.


On May 19, 2006, doss from Stanford, CA (Zone 9b) wrote:

The beauty of Sea Power isn't caught by photos. It catches the light and becomes translucent at the top of the stands. If I had to choose one 'blue' Iris, Sea Power would be it.


On Sep 4, 2005, Joan from Belfield, ND (Zone 4a) wrote:

Awards: American Iris Society Honorable Mention '01; Award of Merit '03; John C. Wister Medal '05; Dykes Memorial Medal '06