Details of...
Scientific Name: Iris ensata
Pronunciation: EYE-riss en-SAY-tuh
Common Name: Japanese water iris
Family Name: Iridaceae
Plant Type: Herbaceous perennial
Key ID Features: Leaves long, narrow; flowers, with 3 (or 4) large flat, spreading or pendent fall petals, alternating with 3 erect, often smaller, standard petals, in late winter, spring or early summer.
Course(s): HORT 2355

Habit: Upright
Form: Vase
Texture: Medium
Mature Size:
Height:0.7 - 1.3m
Spread:0.3 - 0.6m
Growth Rate:Moderate
Origin: S.E. Asia / Japan / China
Hardiness Rating: Zone 5: (-29 to -23 C)
Exposure: Full sun, Part sun/part shade
Soil/ Growing Medium: Humus rich
Water Use: Aquatic
Landscape Uses: Container planting, Cut flower or foliage, Perennial border, Summer interest, Waterside planting
Additional Info: Google. Cultivars shown may include I. 'Lavender Wash', I. 'Shinonome', I. 'Tsuyu-No-Gyokusho', I. 'Variegata', I. 'Velvety Queen', and I. 'Wine Ruffles'. Hybrids include the "soft pink selection".
Japanese water iris
Leaf Morphology: Glossary
Form: Simple
Arrangement: Alternate
Texture/ Venation: Parallel venation, Soft flexible
Colour in Fall: Yellow
Leaf(let) Terms:
Shapes: Elliptic, Ovate
Apices: Acute
Bases: Sheathing
Margins: Entire

Inflorescence Type: Floriferous, Raceme
Flower Morphology:Flowers perfect
Number of Petals:3
Corolla Shape:Ligulate
Ovary Position:Inferior
Colour (petals): Showy, Purple, (Cultivar petal colours include white, blue, pink, etc.)
Flower Scent: None
Flower Time at Peak: Jun, Jul
Additional Info: Like most irises found locally, this is a single flower with one inferior ovary but the stigmas are petal-like to make it appear as three separate flowers.

Fruit Type: Capsule
Fruit Colour: Brown
Fruiting Time: Sep, Oct

Bark or Stem Colour: Green
Organ Modifications: Rhizomes

Propagation: Division - below ground parts
Pest Susceptibility: Rabbit resistant
(WLG) WoodLand Garden
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