Blue Flag, Dagger Flower, Water Iris, Liver Lily

Iris versicolor

Family: Iridaceae (eye-rid-AY-see-ee) (Info)
Genus: Iris (EYE-ris) (Info)
Species: versicolor (VER-suh-kuh-lor) (Info)
» View all varieties of Iris
View this plant in a garden




18-24 in. (45-60 cm)


15-18 in. (38-45 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)

Sun Exposure:

Full Sun


Parts of plant are poisonous if ingested

Bloom Color:


Bloom Time:

Midseason (M)



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:

Unknown - Tell us

Bloom Characteristics:

Unknown - Tell us

Water Requirements:

Requires consistently moist soil; do not let dry out between waterings

Very high moisture needs; suitable for bogs and water gardens

Where to Grow:

Unknown - Tell us


This plant has been said to grow in the following regions:

Wasilla, Alaska

Manchester, Connecticut

Machesney Park, Illinois

Washington, Illinois

Barbourville, Kentucky

Annapolis, Maryland

Deer River, Minnesota

Isle, Minnesota

Frenchtown, New Jersey

Hendersonville, North Carolina

Raleigh, North Carolina

Hulbert, Oklahoma

Oklahoma City, Oklahoma

Dover, Pennsylvania

Broaddus, Texas

Cedar Creek, Texas

Port Lavaca, Texas

Essex Junction, Vermont

Leesburg, Virginia

Roanoke, Virginia

Merrimac, Wisconsin

show all

Gardeners' Notes:


On Jun 13, 2010, theNobody14161 from Kalamazoo, MI wrote:

Looks very similar to Iris virginica.


On May 12, 2010, Kestris from Roanoke, VA (Zone 7b) wrote:

Fast growing. Lots of long, slender leaves. Multiplies like nuts. Blooms last a day, and re in large quantities once it gets established.


On May 11, 2009, leelynne from Dover, PA (Zone 6a) wrote:

At the house I just bought in December these flowers are everywhere. There're probably about 100 of these coming up all along the front of my land. They are very pretty and start blooming here in May. I'm not sure if they need to be separated or not but I think I'm going to try digging some up and giving them away since there are so many because I feel they need to be thinned out a little, they're taking over my front yard!


On Jul 12, 2008, Gabrielle from (Zone 5a) wrote:

Blooms May-June in my garden. Interesting blooms.