Create Your Garden

Iris virginica var. shrevei (Southern Blue Flag)

Shreve's Iris, Virginia Iris, Southern Blue Flag, Blue Flag, Iris virginica 'Shrevii', Iris shrevei, Iris versicolor var. blandescens, Iris versicolor var. shrevei

Iris virginica var. shrevei, Shreve's Iris, Virginia Iris, Southern Blue Flag, Blue Flag, Iris virginica 'Shrevii', Iris shrevei, Iris versicolor var. blandescens, Iris versicolor var. shrevei, Iris for Ponds, Perennial for wet soil, Perennial for poorly drained soils, Purple Flowers

Iris virginica var. shrevei (Southern Blue Flag) is a rhizomatous perennial forming clumps of sword-shaped, mostly erect, bluish green leaves, up to 3 ft. long (90 cm), with a slight, graceful curve. Tall flowering stalks, unbranched or sparingly branched, rise from the clump in late spring to early summer, each of them boasting 1-2 violet-blue flowers, 3 in. across (7 cm). The falls feature a conspicuously veined white basal patch and a yellow blotch. Blooming for about one month, the pleasantly fragrant blossoms give way to fat green pods, about 2 in. long (5 cm). Very handsome, Southern Blue Flag is a central landscape plant for the water garden, near ponds and streams. This aquatic plant is also a lovely addition to moist borders.

  • Grows up to 18-36 in. tall and wide (45-90 cm). Clumps will slowly spread by creeping rhizomes to form colonies.
  • Performs best in full sun in acidic, wet soils. This iris may be grown in up to 6 in. (15 cm) of shallow standing water.
  • A welcomed addition for lily pools, bog gardens, rain gardens, naturalized in wetlands or along streams or ponds. May be grown in borders provided the soil is always kept moist.
  • Propagate by division in early fall when the leaves begin to turn yellow. If propagation is to be made by seed, sow when seeds are ripe (not stored dry).
  • Virtually pest and disease free. Deer resistant.
  • All parts may cause discomfort if ingested. Wear gloves and other protective equipment when handling.
  • Toxic to dogs, toxic to cats, toxic to horses.
  • Native to inland swamps, marshes and flood plains in the eastern United States.

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 5 - 9
Plant Type Aquatic Plants, Perennials
Plant Family Iridaceae
Genus Iris other species
Common names Iris, Blue Flag
Exposure Full Sun
Season of Interest Spring (Late)
Summer (Early)
Height 1' - 3'
(30cm - 90cm)
Spread 1' - 3'
(30cm - 90cm)
Spacing 18" - 24"
(50cm - 60cm)
Maintenance Low
Water Needs High
Soil Type Clay, Loam
Soil pH Acid, Neutral
Soil Drainage Moisture Retentive, Poorly Drained
Characteristics Cut Flowers, Fragrant, Showy
Native Plants United States, New Jersey, New York, Pennsylvania, Maryland, Midwest, Northeast, Southwest, Southeast, Nebraska, Missouri, Illinois, Minnesota, Ohio, Michigan, Indiana, Kansas, Iowa, Wisconsin, Alabama, Kentucky, Arkansas, North Carolina, West Virginia, Tennessee, South Carolina, Mississippi, Louisiana, Texas, Oklahoma
Tolerance Deer, Clay Soil, Wet Soil
Attracts Butterflies
Garden Uses Beds And Borders, Bog Gardens, Ponds And Streams, Rain Gardens, Water Gardens
Garden Styles Prairie and Meadow, Informal and Cottage
How Many Plants
Do I Need?
Guides with
Iris Species
Not sure which Iris Species to pick?
Compare Now

Alternative Plants to Consider

Iris latifolia (English Iris)
Iris lactea (Milky Iris)
Iris chrysographes (Gold-Marked Iris)
Iris macrosiphon (Long Tubed Iris)
Iris setosa (Bristle-Pointed Iris)
Iris hexagona (Dixie Iris)

Recommended Companion Plants

Primula pulverulenta (Candelabra Primrose)
Carex elata ‘Aurea’ (Bowles’ Golden Sedge)
Cephalanthus occidentalis (Button Bush)
Hibiscus coccineus (Scarlet Rose Mallow)
Hymenocallis latifolia (Perfumed Spider Lily)

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.
Buy Plants

Requirements

Hardiness 5 - 9
Plant Type Aquatic Plants, Perennials
Plant Family Iridaceae
Genus Iris other species
Common names Iris, Blue Flag
Exposure Full Sun
Season of Interest Spring (Late)
Summer (Early)
Height 1' - 3'
(30cm - 90cm)
Spread 1' - 3'
(30cm - 90cm)
Spacing 18" - 24"
(50cm - 60cm)
Maintenance Low
Water Needs High
Soil Type Clay, Loam
Soil pH Acid, Neutral
Soil Drainage Moisture Retentive, Poorly Drained
Characteristics Cut Flowers, Fragrant, Showy
Native Plants United States, New Jersey, New York, Pennsylvania, Maryland, Midwest, Northeast, Southwest, Southeast, Nebraska, Missouri, Illinois, Minnesota, Ohio, Michigan, Indiana, Kansas, Iowa, Wisconsin, Alabama, Kentucky, Arkansas, North Carolina, West Virginia, Tennessee, South Carolina, Mississippi, Louisiana, Texas, Oklahoma
Tolerance Deer, Clay Soil, Wet Soil
Attracts Butterflies
Garden Uses Beds And Borders, Bog Gardens, Ponds And Streams, Rain Gardens, Water Gardens
Garden Styles Prairie and Meadow, Informal and Cottage
How Many Plants
Do I Need?
Guides with
Iris Species
Not sure which Iris Species to pick?
Compare Now

Gardening Ideas

Plant Calculator

How many Iris virginica var. shrevei (Southern Blue Flag) do I need for my garden?

Input your garden space dimensions

Your Shopping List

Plant Quantity
Iris virginica var. shrevei (Southern Blue Flag) N/A Buy Plants

Please Login to Proceed

You Have Reached The Free Limit, Please Subscribe to Proceed

Subscribe to Gardenia

To create additional collections, you must be a paid member of Gardenia
  • Add as many plants as you wish
  • Create and save up to 25 garden collections
Become a Member

Plant Added Successfully

You have Reached Your Limit

To add more plants, you must be a paid member of our site Become a Member

Update Your Credit
Card Information

Cancel

Create a New Collection

Sign Up to Our Newsletter

    You have been subscribed successfully

    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!

    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!

    Find your Hardiness Zone

    Find your Heat Zone

    Find your Climate Zone