A picture of a Blu Flag Iris

Blu Flag Iris

Iris versicolor

Also known as

Blue Flag, Boston Iris, Liver Lily, North American Blue Flag, Particoloured Iris, Purple Iris, Snake Lily, Wild Iris, Harlequin Blueflag, Varied-Color Iris, Water Flag, Larger Blue Flag, Multi-Coloured Blue Flag, Northern Blue Flag

Iris versicolor 2 by Dlanglois (CC-BY-SA-3.0)

Full Sun
Moderate care
Frequent watering
Frost Hardy


USDA zone


Minimum temperature

Expected size








5 years to reach maturity


  • spring
  • summer
  • autumn
  • winter

More images of Blu Flag Iris

Iris versicolor 4
Iris versicolor 1
A photo of Blu Flag Iris
A photo of Blu Flag Iris

Blu Flag Iris Overview

Iris versicolor is a bulbous perennial from the Iridaceae family. It produces narrow, grass-like leaves and erect stems with large violet-blue flowers, growing from underground rhizomes. It typically reaches a height of around 0.8-1m. Forming branched stems bearing vibrant blue-purple flowers measuring between 6-8cm across. They have attractive venation, tending towards white inside the flower, these appear in summer and this plant has a clumping habit. Fully hardy, this plant grows well in full sun nd moist, poorly-draining soil.

Common problems with Blu Flag Iris

How to propagate Blu Flag Iris




Special features of Blu Flag Iris

Attracts butterflies

Attractive flowers

Other uses of Blu Flag Iris

Aquatic, bog, border, cutting bed.

Purple Flowering Summer Plants

Love purple flowers and looking for summer inspiration.

Explore all

Marginal Plants

Plants that prefer to grow at the margins of ponds, lakes and waterway.

Explore all