Intermediate Bearded Iris 'Agatha Christie'


Family: Iridaceae (eye-rid-AY-see-ee) (Info)
Genus: Iris (EYE-ris) (Info)
Cultivar: Agatha Christie
Hybridized by Sutton
Registered or introduced: 1996
» View all varieties of Iris


Intermediate Bearded (IB)


18-24 in. (45-60 cm)


12-15 in. (30-38 cm)

15-18 in. (38-45 cm)

18-24 in. (45-60 cm)


USDA Zone 3a: to -39.9 C (-40 F)

USDA Zone 3b: to -37.2 C (-35 F)

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

Handling plant may cause skin irritation or allergic reaction

Bloom Color:



Bloom Time:

Extra early (EE)

Early (E)

Early midseason (EM)



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:

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

Awards (if applicable):

Honorable Mention

Foliage Color:

Unknown - Tell us

Bloom Characteristics:

Unknown - Tell us

Water Requirements:

Average Water Needs; Water regularly; do not overwater

Where to Grow:

Unknown - Tell us


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


San Jose, California

Boise, Idaho

Cedar Rapids, Iowa

Wichita, Kansas

Deer River, Minnesota

Robertsville, Missouri

Weatherby, Missouri

Shepherd, Montana

Winnemucca, Nevada

Coshocton, Ohio

Murfreesboro, Tennessee

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Gardeners' Notes:


On Aug 1, 2014, patciris44 from Winnemucca, NV wrote:

I am looking for a source to buy or trade for this iris


On Mar 25, 2006, Joan from Belfield, ND (Zone 4a) wrote:

American Iris Society Awards: Honorable Mention 2002


On Oct 21, 2005, laurief from Deer River, MN (Zone 3b) wrote:

Most intermediate beardeds (IBs) do quite well in my growing conditions. This northern MN zone 3b climate inflicts severe, extended cold during the winter months, often with little snow cover for insulation. The summer growing season is short with temps that sometimes exceed 90 degrees F. My soil is very heavy, compacted clay with a slightly acid pH, though I grow my irises in well-amended, raised beds or windrows with improved friability and drainage. A large local deer population frequently tramples and sometimes grazes on my irises in early spring and late fall. Iris borers are present but managed successfully with a granular systemic grub control product. Weeds are abundant and only occasionally beaten back by an admittedly lazy gardener (yours truly). Fertilization is inconsistent, wh... read more


On Apr 25, 2004, brimmsplace from Murfreesboro, TN wrote:

Has bloomed profusely the last 3 years.