Species Iris, Siberian Iris

Iris sibirica

Family: Iridaceae (eye-rid-AY-see-ee) (Info)
Genus: Iris (EYE-ris) (Info)
Species: sibirica (sy-BEER-ah-kuh) (Info)
Synonym:Iris acuta
Synonym:Iris bicolor
Synonym:Iris erirrhiza
Synonym:Iris flexuosa
Synonym:Iris maritima
» View all varieties of Iris
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Siberian (SIB)


24-36 in. (60-90 cm)


18-24 in. (45-60 cm)


USDA Zone 4a: to -34.4 C (-30 F)

USDA Zone 4b: to -31.6 C (-25 F)

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


Parts of plant are poisonous if ingested

Bloom Color:

Light Blue

Dark Blue

Medium Blue

White/Near White

Bloom Time:

Late Midseason (MLa)




Other details:

Unknown - Tell us

Soil pH requirements:

6.1 to 6.5 (mildly acidic)

6.6 to 7.5 (neutral)

7.6 to 7.8 (mildly alkaline)

Patent Information:


Propagation Methods:

By dividing rhizomes, tubers, corms or bulbs (including offsets)

Seed Collecting:

Allow pods to dry on plant; break open to collect seeds

Awards (if applicable):

Unknown - Tell us

Foliage Color:


Bloom Characteristics:

Flowers are good for cutting

This plant is attractive to bees, butterflies and/or birds

Water Requirements:

Average Water Needs; Water regularly; do not overwater

Where to Grow:

Grow outdoors year-round in hardiness zone

Can be grown as an annual


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

Tallassee, Alabama

Anchor Point, Alaska

Nikolaevsk, Alaska

Auberry, California

Fremont, California

Broomfield, Colorado

Mansfield Center, Connecticut

Wethersfield, Connecticut

Dallas, Georgia

Marietta, Georgia

Stone Mountain, Georgia

Machesney Park, Illinois

Mount Prospect, Illinois

Spring Grove, Illinois

Washington, Illinois

Waukegan, Illinois

Logansport, Indiana

Mitchell, Indiana

South Bend, Indiana

Sherrill, Iowa

Wichita, Kansas

Lancaster, Kentucky

Morehead, Kentucky

Smiths Grove, Kentucky

Sunset, Louisiana

Harrison, Maine

Lisbon, Maine

Brookeville, Maryland

Gaithersburg, Maryland

Mashpee, Massachusetts

Norton, Massachusetts

Roslindale, Massachusetts

Southborough, Massachusetts

Brighton, Michigan

Kalamazoo, Michigan

Pinconning, Michigan

Saint Clair Shores, Michigan

Minneapolis, Minnesota

Saint Cloud, Minnesota

Greenfield, New Hampshire

Munsonville, New Hampshire

Browns Mills, New Jersey

Livingston, New Jersey

Mount Laurel, New Jersey

Lamy, New Mexico

Santa Fe, New Mexico

Croton On Hudson, New York

Southold, New York

Elizabeth City, North Carolina

Winston Salem, North Carolina

Cincinnati, Ohio

Dundee, Ohio

Portland, Oregon

Mountain Top, Pennsylvania

Watsontown, Pennsylvania

West Kingston, Rhode Island

Rock Hill, South Carolina

Lawrenceburg, Tennessee

Nashville, Tennessee

Leesburg, Virginia

Newport News, Virginia

Powhatan, Virginia

Wytheville, Virginia

Aberdeen, Washington

Bellevue, Washington

Kalama, Washington

North Sultan, Washington

Sultan, Washington

Huntington, West Virginia

Sandyville, West Virginia

Marinette, Wisconsin

Pulaski, Wisconsin

Waterloo, Wisconsin

Wittenberg, Wisconsin

Kinnear, Wyoming

Riverton, Wyoming

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Gardeners' Notes:


On Apr 8, 2014, coriaceous from ROSLINDALE, MA wrote:

Siberian irises are first-rate garden perennials, tough and adaptable. They are less prone to disease and iris borer than tall bearded iris, require division less frequently, and perform better under crowded border conditions. Most garden centers carry only the old 'Caesar's Brother' and 'Butter and Sugar'.

However, there's been a great deal of progress in Siberian breeding since those two were introduced. Modern cultivars are more floriferous and bloom longer, many with larger flowers, and in a wider variety of colors (including not just white, violet, and true blue, but also yellow, wine red, mulberry, caramel, bronze, persimmon, cinnamon, pink, and slate gray).

Check out the winners of the Morgan-Wood Medal over the last twenty years: ... read more


On Sep 18, 2011, appleflower from New York, NY wrote:

Two clumps of Siberian iris grow against the house on the north side (very shady) here at altitude 6800 feet altitude in northern New Mexico. The house is 6 years old and we have been here for 16 months. The flowers are lovely. The plants get no attention but they are irrigated from a cistern twice a week (15 minutes) for 4 months a year (we have a short season, average May 15-October 15).

I have been told that they will grow "anywhere" here. I'll try them in a sunny non-irrgated area first.


On Jul 14, 2011, Gabrielle from (Zone 5a) wrote:

I have several varities of this and prefer the ones with a darker shade of purple. They are gorgeous! Blooms May-June in my garden.


On Jun 3, 2008, Meig from Timnath, CO (Zone 5b) wrote:

Dependable in my very windswept, prairie-like garden. Flowers aren't as showy as bearded iris, but I find them charming.


On May 14, 2005, henryr10 from Cincinnati, OH (Zone 6b) wrote:

I'm not a fan of the big 'beards'.
(Maybe because we grew hundreds when I was a kid. lol)

This much more dainty and fragile looking Iris is more to my liking.
They may look dainty and fragile but definitely aren't.
Our clump has been here at least 40 years.
Buried in the back under a weedy Wisteria vine for at least 20 years it sprang back beautifully when released.
We divided it last Fall and forgot a clump.
It over-wintered in a pan of water.

Where it is now 2' tall and loaded w/ flowers.


On Jan 17, 2005, LilyLover_UT from Ogden, UT (Zone 5b) wrote:

This gorgeous perennial has been very easy for me to grow. I haven't had any pest problems. It can withstand some drought and poor soil, although I'm sure it would do better in moist soil. I've also grown it as a pond plant on a shallow ledge. Siberian iris has a short bloom season, and it appreciates some afternoon shade when blooming, since the flowers are fragile.


On Aug 31, 2001, Sis wrote:

Susceptible to iris borer. The moths lay
their eggs in the leaves and the young
tunnel down the leaves to hollow out the
rhizome. Borers also spread bacterial rot,
which kills the iris from the ground up.

Good culture is the best preventive. Re-
move dead foliage in spring and fall. Smash
the grubs between your fingers while they
are in the leaves. Dig up affected plants
and cut off affected portions of the rhiz-


On Aug 10, 2001, eyesoftexas from Toadsuck, TX (Zone 7a) wrote:

This versatile iris is suitable for a herbaceous border as well as the margins of an informal pond. The slender, sword-like, midgreen leaves die down in winter. The flowers are about 2 1/2 inches wide and are borne during midsummer. In the original species, they are in various shades of blue with white veining on the falls. Because the original species hybridizes freely, only hybrids are usually available.

Cultivation: Grows best in moist soil, but will also perform well in a herbaceous border, where it usually does not grow so high. lant rhizomes 1 inch deep in the soil in autumn or spring.

Propagation: Easily increased by lifting and dividing every four to five years.