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PlantFiles: Crested Iris
Iris cristata 'Powder Blue Giant'

Family: Iridaceae (eye-rid-AY-see-ee) (Info)
Genus: Iris (EYE-ris) (Info)
Species: cristata (kris-TAY-tuh) (Info)
Cultivar: Powder Blue Giant

» View all varieties of Iris

5 vendors have this plant for sale.

3 members have or want this plant for trade.


6-12 in. (15-30 cm)

12-15 in. (30-38 cm)
15-18 in. (38-45 cm)
18-24 in. (45-60 cm)

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
Sun to Partial Shade

Parts of plant are poisonous if ingested

Bloom Color:
Pale Yellow
White/Near White

Bloom Time:
Midseason (M)


Other details:
Requires consistently moist soil; do not let dry out between waterings
Very high moisture needs; suitable for bogs and water gardens

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:
Unknown - Tell us

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

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to view:

By flowerhead410
Thumbnail #1 of Iris cristata by flowerhead410


1 positive
3 neutrals
No negatives

Gardeners' Notes:

Positive parrotma32578 On Mar 15, 2015, parrotma32578 from Niceville, FL (Zone 8b) wrote:

This is a plant that I plant and ignore. It is a fast spreader - having runners that go under ground, they have spread the entire length of my yard; however, the plants on the runners are sporadic. This creates a surplus to share. They do bloom better with partial sun, but I have them in both - I just get more blooms with partial sun.

Neutral celesteresort On Feb 12, 2011, celesteresort from Port Orchard, WA wrote:

I have not grown this plant. There is conflicting information between Dave's Garden PlantFiles and propagator information, at least that's what it appears. PlantFiles states that it needs consistently moist soil and is suitable for bog gardens.
Propagator information indicates that it does best in dry woodland sites (or that type of situation).
If anyone can clarify this information, or correct it, I would appreciate.

Neutral bluespiral On Jan 25, 2007, bluespiral from (Zone 7a) wrote:

This plant definitely sets seed, which I just received in generous quantity from the North American Rock Garden Society. Although it probably won't come true to its parent, any and all seedlings will be treasured in my garden.

Neutral Joan On Apr 15, 2006, Joan from Belfield, ND (Zone 4a) wrote:

Collected in wild, west of Litchfield, Kentucky


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

Niceville, Florida
Concord, North Carolina
Wilkes Barre, Pennsylvania

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