Photo by Melody

PlantFiles: Siberian Iris
Iris sibirica 'Caesar's Brother'

Family: Iridaceae (eye-rid-AY-see-ee) (Info)
Genus: Iris (EYE-ris) (Info)
Species: sibirica (sy-BEER-ah-kuh) (Info)
Cultivar: Caesar's Brother
Hybridized by Morgan; Year of Registration or Introduction: 1932

» View all varieties of Iris

11 vendors have this plant for sale.

36 members have or want this plant for trade.

Siberian (SIB)

36-48 in. (90-120 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
Handling plant may cause skin irritation or allergic reaction

Bloom Color:
White/Near White

Bloom Time:
Late Midseason (MLa)


Other details:
Average Water Needs; Water regularly; do not overwater
This plant is resistant to deer

Soil pH requirements:
5.6 to 6.0 (acidic)
6.1 to 6.5 (mildly acidic)
6.6 to 7.5 (neutral)

Patent Information:

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

Seed Collecting:
N/A: plant does not set seed, flowers are sterile, or plants will not come true from seed

Awards (if applicable):
Morgan-Wood Medal (SIB)

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There are a total of 30 photos.
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8 positives
2 neutrals
No negatives

Gardeners' Notes:

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

Siberian irises are first-rate garden perennials, tough and adaptable, and 'Caesar's Brother' is just a good a performer as it was eighty years ago when it was introduced.

However, there's been a great deal of progress in Siberian breeding since then. Check out the winners of the Morgan-Wood medal over the last twenty years to see even better irises, most with higher bud count, many with larger flowers, some with repeat bloom, and in a wider variety of colors :

As with all siberians, the narrow foliage is tidily upright during bloom season, and then gradually splays open as the season progresses, sometimes smothering close neighbors in the process. Clumps begin to die out in the center after 3 to 5 years, signaling the need for division.

Positive themikeman On Apr 7, 2011, themikeman from Concord, NC (Zone 7a) wrote:

Ceasars Brother is a classic siberian iris..siberian iris sometimes take a couple years of growth to establish themselves i understand before they will bloom. i have only had mine a short time and it has not bloomed yet but it is healthy and vigorous in terms of vegatative growth. my friend sheila in illinois has grown this for close to three decades and it has spread across the whole back half of her huge property..the pics she sent me of her hundreds of blue-purple blooms were breathtaking..mike

Neutral ldekker On Jul 18, 2010, ldekker from Daly City, CA wrote:

I had 2 plants installed into my landscape last fall.
By spring the green leaves began to shoot up.
I watched and watched and finally found some faded blooms had appeared. I missed their bloom because they bloomed near the ground level.
Does this mean they were planted to deep or are they just young plants? They are on a drop irrigation, in foggy Daly City California. I am hoping year two will be better.

Positive dreamgreen On May 10, 2009, dreamgreen from Weaverville, NC wrote:

This is one tough & persistant iris. Beautiful too. I transplanted my Caesar's Brother from a field that was an old home site. The house was torn down in the 1950s but this iris remained and bloomed among blackberry vines and tall grass with no care for half a century! It is identical to the other 'Ceasar's Brother' irises that I have grown for years. It was hybridized by Morgan and was the Morgan award winner in 1953.

Positive pinballer3 On Feb 26, 2009, pinballer3 from Brighton, CO (Zone 5a) wrote:

This Iris has thrived in alkaline clay soil with drip line watering in summer for four years. Last year, there were 8-10 blooms on each clump. The plant gets full hot sun on a southern slope in summer but is shaded by the house in winter. Looks like its time to divide them now, as the centers are just now thinning out. This is a hearty plant with spring flowers that always get compliments!

Positive konijntje On Apr 26, 2008, konijntje from Seattle, WA (Zone 8a) wrote:

This plant has been a phenomenal success under the most oppressive conditions. We have a steeply sloping concrete driveway which channels rivers of water down to the bottom any time we get a Georgia cloudburst. This leaves the bottom of the drive flooded and filled with the soil the water brought down with it. We dug a swale at the edge of the yard next to the driveway bottom to drain the water and silt out of the drive, which it does. However, this swale area goes from one awful condition to the other (arid clay in the unrelenting full sun most of the time to swamped and silty after a rain). On the advice of the folks at Triple Creek Flower Farm (see DG Garden Watchdog) last September, we planted several miscanthus and several Caesar's Brother iris in that swale after adding moderate soil amendments and covered it with round egg rocks. We didn't touch it with water or anything else in the months since. The foliage has flourished since late winter and this week (April 25) the startlingly beautiful deep midnight blue blooms are opening in heavy profusion on elegant, slender stalks. If it can perform so well in this situation, I can't imagine what it would do somewhere nurturing. Thanks to Triple Creek for their has turned an ugly problem area into a purposeful, lovely focal point.

Neutral dmj1218 On May 28, 2006, dmj1218 from west Houston, TX (Zone 9a) wrote:

This variety of siberian iris performs well in Houston, Texas.

Positive Tjsangel On Jun 9, 2005, Tjsangel from Warren, OH wrote:

One of my favorite iris. Lots of deep purple blooms, foliage is also beautiful. Likes some moisture. Dependable.

Positive awatson On Aug 22, 2003, awatson from Wayland, MA wrote:

Also Groundhog resistant.

Positive carolann On Jun 22, 2003, carolann from Auburn, NH wrote:

One of early summer's most dependable blooms here in z5. Beautiful color and high bud count.


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

Brownsboro, Alabama
Mobile, Alabama
Georgetown, California
Avon, Colorado
Brighton, Colorado
Denver, Colorado
Pensacola, Florida
Tampa, Florida
Barnesville, Georgia
Braselton, Georgia
Douglasville, Georgia
Marietta, Georgia
Rockford, Illinois
Fort Wayne, Indiana
Indianapolis, Indiana
Logansport, Indiana
Ewing, Kentucky
Hebron, Kentucky
Lexington, Kentucky
Morehead, Kentucky
Baton Rouge, Louisiana
South Paris, Maine
Attleboro, Massachusetts
Nantucket, Massachusetts
Roslindale, Massachusetts
Uxbridge, Massachusetts
Wayland, Massachusetts
Franklin, Michigan
Trenton, Michigan
Warren, Michigan
Andover, Minnesota
Hopkins, Minnesota
Lake City, Minnesota
New Prague, Minnesota
Lincoln, Nebraska
Omaha, Nebraska
Auburn, New Hampshire
Alden, New York
Bridgehampton, New York
Glen Head, New York
Phoenicia, New York
Concord, North Carolina
Greenville, North Carolina
Jacksonville, North Carolina
Wake Forest, North Carolina
Weaverville, North Carolina
Belfield, North Dakota
Columbia Station, Ohio
Columbus, Ohio
Warren, Ohio
Bend, Oregon
Portland, Oregon
Allentown, Pennsylvania
Meshoppen, Pennsylvania
Pittsburgh, Pennsylvania
Wakefield, Rhode Island
Fort Mill, South Carolina
Hixson, Tennessee
Lafayette, Tennessee
Lenoir City, Tennessee
Coppell, Texas
Kerrville, Texas
San Antonio, Texas
Montpelier, Vermont
Portsmouth, Virginia
Freeland, Washington
Kalama, Washington
Richland, Washington
White Center, Washington
Madison, Wisconsin (3 reports)
Waterloo, Wisconsin
Watertown, Wisconsin
Lander, Wyoming

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