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Iris prismatica (Slender Blue Iris)

Slender Blue Iris, Slender Blue Flag, Coastal Iris, Iris carolina, Iris prismatica var. austrina

Iris prismatica, Slender Blue Iris, Slender Blue Flag, Coastal Iris, Iris carolina, Iris prismatica var. austrina , Iris for Ponds, Perennial for wet soil, Perennial for poorly drained soils, Purple Flowers
Iris prismatica, Slender Blue Iris, Slender Blue Flag, Coastal Iris, Iris carolina, Iris prismatica var. austrina , Iris for Ponds, Perennial for wet soil, Perennial for poorly drained soils, Purple Flowers
iris prismatica
Iris prismatica, Slender Blue Iris, Slender Blue Flag, Coastal Iris, Iris carolina, Iris prismatica var. austrina , Iris for Ponds, Perennial for wet soil, Perennial for poorly drained soils, Purple Flowers

Iris prismatica (Slender Blue Iris) is a rhizomatous perennial forming a clump of long, narrow, grass-like leaves topped with slender-petaled flowers, up to 2-4 in. across (5-10 cm) from late spring to mid-summer. The blossoms feature pale blue to blue-violet flowers with falls adorned with a central white pattern. Native to the southern and eastern United States, Slender Blue Iris occurs naturally in bogs and marshes. It grows by sending out thin extension rhizomes that sprout and form new clumps of fans. Easy to grow, deer resistant, it tolerates the salty conditions of seaside gardens and prefers soil that is moist or only slightly submerged. Attractive to birds and hummingbirds, Slender Blue Iris is a good choice for bog gardens, near ponds and streams.

  • Grows up to 12-36 in. tall (20-30 cm) and 12-36 in. wide (30-90 cm).
  • Performs best in full sun or part shade, in acidic, moist to wet soils. Tolerates some summer drought and occasional seasonal flooding. This iris plant should not be submerged to the bottom of the pond for overwintering but will last until spring quite well if simply left in place at the margin of the water garden.
  • A welcomed addition to coastal gardens, bog gardens, and near streams or ponds, where it will provide excellent color contrast.
  • Propagate by seed or by division. Sow seeds outside as soon as they are ripe. Seedlings will germinate in one year and flower in two.
  • No serious pest or disease issues. Deer resistant.
  • Rhizomes and rootstocks are poisonous. Minor skin irritation when touched, low toxicity if ingested.
  • Toxic to dogs, toxic to cats, toxic to horses.
  • Native to the southern and eastern United States from Maine south to Alabama, as well as to the Canadian provinces of Ontario and Nova Scotia.

Irises: How to Grow and Care with Success


Want to learn how to grow and care for irises like a pro? Follow these simple steps and enjoy the beauty of these striking plants

Requirements

Hardiness 3 - 9
Plant Type Perennials
Plant Family Iridaceae
Genus Iris other species
Exposure Full Sun, Partial Sun
Season of Interest Spring (Late)
Summer (Early, Mid)
Height 1' - 3'
(30cm - 90cm)
Spread 1' - 3'
(30cm - 90cm)
Maintenance Low
Water Needs Average, High
Soil Type Clay, Loam
Soil pH Acid, Neutral
Soil Drainage Moist but Well-Drained, Moisture Retentive
Characteristics Showy
Native Plants United States, Maryland, Massachusetts, Maine, New Hampshire, New Jersey, New York, Delaware, Pennsylvania, Rhode Island, Vermont, Connecticut, Southeast, Northeast, Georgia, North Carolina, South Carolina, Tennessee, Virginia
Tolerance Deer, Salt, Wet Soil
Attracts Birds
Garden Uses Bog Gardens, Ponds And Streams
Garden Styles Coastal Garden
How Many Plants
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Alternative Plants to Consider

Iris virginica var. shrevei (Southern Blue Flag)
Iris latifolia (English Iris)
Iris lactea (Milky Iris)
Iris chrysographes (Gold-Marked Iris)
Iris macrosiphon (Long Tubed Iris)
Iris hexagona (Dixie Iris)

Find In One of Our Guides or Gardens

Native Plant Alternatives to Iris pseudacorus (Yellow Iris)
Irises: How to Grow and Care with Success
While every effort has been made to describe these plants accurately, please keep in mind that height, bloom time, and color may differ in various climates. The description of these plants has been written based on numerous outside resources.
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Requirements

Hardiness 3 - 9
Plant Type Perennials
Plant Family Iridaceae
Genus Iris other species
Exposure Full Sun, Partial Sun
Season of Interest Spring (Late)
Summer (Early, Mid)
Height 1' - 3'
(30cm - 90cm)
Spread 1' - 3'
(30cm - 90cm)
Maintenance Low
Water Needs Average, High
Soil Type Clay, Loam
Soil pH Acid, Neutral
Soil Drainage Moist but Well-Drained, Moisture Retentive
Characteristics Showy
Native Plants United States, Maryland, Massachusetts, Maine, New Hampshire, New Jersey, New York, Delaware, Pennsylvania, Rhode Island, Vermont, Connecticut, Southeast, Northeast, Georgia, North Carolina, South Carolina, Tennessee, Virginia
Tolerance Deer, Salt, Wet Soil
Attracts Birds
Garden Uses Bog Gardens, Ponds And Streams
Garden Styles Coastal Garden
How Many Plants
Do I Need?
Guides with
Iris Species
Not sure which Iris Species to pick?
Compare Now

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