Perennials

Iris sibirica

Siberian iris

Also known as: Siberian flag

Siberian iris flower. species photograph

An upright clump of narrow leaves with blue-purple flowers in late spring to early summer. This listing is the unnamed species, not a selected cultivar. Divide crowded clumps when flowering declines.

At a glance

Sun: Full sun to part shade
Mature size: About 2 ft. tall × 30–36 in. wide
Water: Evenly moist; well-drained soil
Hardiness: USDA zones 3–8
Bloom: Typically blue-purple; late spring–early summer.

Sizes & prices

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Catalog updated September 8, 2026. This is not a live stock count; please call to confirm availability and price.

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Resistance & tolerances

Drought: Some tolerance once established; best with even moisture.
Wet soil: Tolerates occasional wetness; use moist, draining soil.
Black walnut: Listed as tolerant.
Deer & rabbits: Resistant, not browse-proof.

Resistance is not a guarantee; deer and rabbits may browse any plant.

Pollinators & wildlife

Attracts: Bees, Butterflies

Keep in mind: Harmful if eaten; sap can irritate skin. Wear gloves when dividing.

Seasonal interest

Foliage: Narrow blue-green leaves; interesting seed pods.

Growing & care

Light: Too much shade reduces flowers and stem strength.
Establishment: Keep consistently moist while roots establish.
Fall cleanup: After a hard frost, remove old leaves, stems and nearby debris to reduce overwintering iris-borer eggs.

Sources & photo credits

NC State Extension

University of Minnesota Extension

Photo: Wouter Hagens · CC BY-SA 3.0

Image notes: Siberian iris flower. species photograph; uncropped.

Reviewed September 21, 2026. Growing conditions vary by location.