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Loughmiller, Campbell and Lynn
Iris giganticaerulea Small
Blue flag, Giant blue iris
Synonym(s): Iris alticristata, Iris aurilinea, Iris citricristata, Iris elephantina, Iris fluviatilis, Iris miraculosa, Iris paludicola, Iris parvicaerulea, Iris rivularis, Iris venulosa, Iris wherryana
USDA Symbol: IRGI
USDA Native Status: L48 (N)
The giant blue iris grows 3–5 feet tall and prefers freshwater marshes. The leaves are 30 inches long or less and 1 1/2 inches wide; they clasp the stem near the base. The blue outer tepals, 3 inches long by 1 3/4 inches wide, are marked with a whitish patch with a prominent yellow center; they hang down and are called falls. The blue, erect inner tepals are 3 inches long and are called standards.
A member of the iris family (family Iridaceae) which consists of herbs growing from rhizomes, bulbs, or corms, with narrow basal leaves and showy clusters at the tips of long stalks. There are about 60 genera and 1,500 species, distributed in temperate and tropical regions. Among them, Iris, Freesia, Gladiolus, Bugle Lily, and Montbretia are popular ornamentals. Saffron dye is obtained from Crocus, and essence of violets, used in perfumes, is extracted from the rhizomes of Iris.
Plant CharacteristicsDuration: Perennial Habit: Herb Fruit: Size Class:
Bloom InformationBloom Color: Blue , Purple
Bloom Time: Mar , Apr
DistributionUSA: LA Native Distribution: LA
coastal areas Native Habitat:
Fresh water habitats, tolerates brackish water to some extent
Growing ConditionsLight Requirement: Part Shade
Soil Moisture: Wet
Soil Description: Wet, rich soils.
Conditions Comments: Tolerates flooded conditions.
BenefitConspicuous Flowers: yes
Clump division is the usual method of increase. All native
iris can be grown from seed. Seed Collection:
Not Available Seed Treatment:
Not Available Commercially Avail:
National Wetland Indicator Status
|Status:|| OBL |
This information is derived from the U.S. Army Corps of Engineers National Wetland Plant List, Version 3.1
(Lichvar, R.W. 2013. The National Wetland Plant List: 2013 wetland ratings. Phytoneuron 2013-49: 1-241). Click here
for map of regions.
Record Last Modified: 2008-05-18
Research By: TWC Staff