Japanese Water Iris, Japanese Flag, Russian Iris 'Raspberry Glow'

Iris ensata

Family
Iridaceae (eye-rid-AY-see-ee)
Genus
Iris (EYE-ris)
Species
ensata (en-SA-tuh)
Synonym
Iris kaempferi
Height
36-48 in. (90-120 cm)
Spacing
15-18 in. (38-45 cm)
18-24 in. (45-60 cm)
Hardiness
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)
USDA Zone 9a: to -6.6 °C (20 °F)
USDA Zone 9b: to -3.8 °C (25 °F)
Sun Exposure
Full Sun
Danger
Parts of plant are poisonous if ingested
Bloom Color
Magenta (pink-purple)
Blue-Violet
Foliage
Herbaceous
Class
Japanese (JI)
Bloom Time
Late Midseason (MLa)
Other Details
Other details
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
Soil pH requirements
5.1 to 5.5 (strongly acidic)
5.6 to 6.0 (acidic)
6.1 to 6.5 (mildly acidic)
Patent Information
Non-patented
Awards (if applicable)
Honorable Mention
Award of Merit
J. A. Payne Medal (JI)
Foliage Color
Bloom Characteristics
Water Requirements
Requires consistently moist soil; do not let dry out between waterings
Very high moisture needs; suitable for bogs and water gardens
Where to Grow
Regional

This plant is said to grow outdoors in the following regions:

Southold, New York

Coshocton, Ohio

Vancouver, Washington

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Gardener's Notes:

1
positive
1
neutral
0
negative
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J
J
Belfield, ND (Zone 4a) | January 2006 | neutral

Awards: Honorable Mention 1997; Award of Merit 1999; Payne Medal 2003

K
Ipswich, MA (Zone 5b) | January 2005 | positive

(J.T. Aitkin) 1992 (Hue and Cry x Electric Rays) Very wide form with barely overlapping slight ruffling falls. Some falls held upright....Read More

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