Alphabetical Plant Listing

Iris prismatica (Slender Blue Iris)

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


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) in 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.
  • 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.

Not sure which Iris - Other to pick?
Compare All Iris - Other

Buy Iris prismatica (Slender Blue Iris)

Requirements

Hardiness 3 – 9
Plant Type Perennials
Plant Family Iris - Other
Exposure Full Sun, Partial Sun
Season of Interest Spring (Late)
Summer (Early,Mid)
Height 1' – 3' (30cm – 90cm)
Spread 1' – 3' (30cm – 90cm)
Water Needs Average, High
Maintenance Low
Soil Type Clay, Loam
Soil pH Acid, Neutral
Soil Drainage Moist but Well-Drained, Moisture Retentive
Characteristics Showy
Native Plants United States, Northeast, Connecticut, Delaware, Maine, Massachusetts, Maryland, New Hampshire, New Jersey, New York, Pennsylvania, Rhode Island, Vermont, Southeast, 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

Buy Plants

Guides with Iris - Other


Doug McGrady, Peganum, Flickr

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.


Requirements

Hardiness 3 – 9
Plant Type Perennials
Plant Family Iris - Other
Exposure Full Sun, Partial Sun
Season of Interest Spring (Late)
Summer (Early,Mid)
Height 1' – 3' (30cm – 90cm)
Spread 1' – 3' (30cm – 90cm)
Water Needs Average, High
Maintenance Low
Soil Type Clay, Loam
Soil pH Acid, Neutral
Soil Drainage Moist but Well-Drained, Moisture Retentive
Characteristics Showy
Native Plants United States, Northeast, Connecticut, Delaware, Maine, Massachusetts, Maryland, New Hampshire, New Jersey, New York, Pennsylvania, Rhode Island, Vermont, Southeast, 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

Guides with Iris - Other

Plant Calculator

How many Iris prismatica (Slender Blue Iris) do I need for my garden?

%
ft
ft

Your Shopping List

Plant Quantity
Iris prismatica (Slender Blue Iris)

Find your Hardiness Zone

Find your Climate Zone

Find your Heat Zone

Join Gardenia.net

Create a membership account to save your garden designs and to view them on any device.

Becoming a contributing member of Gardenia is easy and can be done in just a few minutes. If you provide us with your name, email address and the payment of a modest $25 annual membership fee, you will become a full member, enabling you to design and save up to 25 of your garden design ideas.

Join now and start creating your dream garden!

Create a New Collection

Optional. For your reference.


Move Selected Plants to a Different Collection


Delete Collection

This field is required.