Skip to main content
A picture of a Siberian Iris

Siberian Iris

Iris sibirica

Also known as

Siberian Flag

Iris sibirica 1 by Franz Xaver (CC BY-SA 3.0)

Full Sun
Easy care
Moderate watering
Frost Hardy


RHS hardiness


Minimum temperature

Expected size








3 years to reach maturity


  • spring
  • summer
  • autumn
  • winter

This plant has no fragrance

More images of Siberian Iris

Some purple Iris sibirica flowers on a plant
Some purple Iris sibirica flowers in a field
A purple Iris sibirica flower on a plant
A photo of Siberian Iris
A photo of Siberian Iris

Siberian Iris Overview

Iris sibirica is a herbaceous perennial that grows from underground rhizomes. This stunningly marked species has narrow grass-like foliage and typically grows to a height of around 1.2m. It produces branched stems bearing 5 violet-blue flowers with white at the base and a purple veining overlay. They appear in early summer. Iris sibirica likes full sun or partial shade and fertile, moist, well-draining soil. Never allow it to become water-logged. When planting, dig in well-rotted organic matter - especially if the soil is on the dry side - and apply a mulch around the plant each spring. A popular and eye-catching plant, Iris sibirica is suitable for most garden situations and styles, including cottage, courtyard and coastal. It is also known as Siberian Iris or Siberian Flag.

Common problems with Siberian Iris

How to propagate Siberian Iris


Divide rhizomes in midsummer to early autumn.


Special features of Siberian Iris

Attracts bees

Attractive flowers

Other uses of Siberian Iris

Erosion control, cutting bed.

Blue Flowering Summer Plants

Love blue flower and looking for summer inspiration.

Explore all

Bog Plants

Browse our collection of plants that will prefer to grow in bog conditions.

Explore all