Tall Bearded Iris 'Joyce Terry'


Family: Iridaceae (eye-rid-AY-see-ee) (Info)
Genus: Iris (EYE-ris) (Info)
Cultivar: Joyce Terry
Hybridized by Muhlestein
Registered or introduced: 1974
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Tall Bearded (TB)


36-48 in. (90-120 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:

Bright Yellow

White/Near White

Bloom Time:

Midseason (M)

Late Midseason (MLa)

Late (La)



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

Award of Merit

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:


Chino Valley, Arizona

Tucson, Arizona (2 reports)

Yosemite Lakes, California

Des Plaines, Illinois

Lawton, Oklahoma

Ponca City, Oklahoma

Celina, Tennessee

Greeneville, Tennessee

Thompsons Station, Tennessee

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Gardeners' Notes:


On Jun 27, 2007, Joan from Belfield, ND (Zone 4a) wrote:

Awards: Honorable Mention 1975; Award of Merit 1978


On May 18, 2004, dapeodee from Sandy, UT wrote:

My uncle, Tell Muhlestein was the hybridizer from Provo, Utah. He named this iris after my mother, who's maiden name was Joyce Terry. (Both deceased.) Tell was world famous for his iris and he traveled extensively throughout the United States judging floral shows. I remember as a child collating his iris catalogues which were then in turn mailed throughout the United States in the 1960's and early 1970's. They have been a part of our family's garden since then. We love the Joyce Terry Iris!


On Nov 25, 2003, Margiempv from Oro Valley, AZ (Zone 9a) wrote:

Vigorous grower! It reblooms for me in Arizona. Still stunning after all these years!


On Jun 20, 2003, NellPercy from Ponca City, OK wrote:

Photo is accurate. Grows well, blooms fairly well, multipies slowly. Even though that doesn't sound like a glowing endorsement, Joyce is very bright and reliable.
38" S clean yellow; F flaring white, border of yellow; yellow B. Muhlestein 1974