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Intermediate Bearded Iris 'Protocol'


Family: Iridaceae (eye-rid-AY-see-ee) (Info)
Genus: Iris (EYE-ris) (Info)
Cultivar: Protocol
Hybridized by Keppel
Registered or introduced: 1994
» 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:

Pale Yellow

Bright Yellow

White/Near White

Bloom Time:

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)

Allow cut surface to callous over before planting

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

Hans and Jacob Sass Medal (IB)

Foliage Color:

Unknown - Tell us

Bloom Characteristics:

Flowers are fragrant

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:


Colorado Springs, Colorado

Montrose, Colorado

Hagerstown, Maryland

Deer River, Minnesota

Robertsville, Missouri

Omaha, Nebraska

Los Alamos, New Mexico

Roswell, New Mexico

Enid, Oklahoma

Greeneville, Tennessee

Marshall, Texas

Marion, Wisconsin

Casper, Wyoming

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Gardeners' Notes:


On May 12, 2009, pajaritomt from Los Alamos, NM (Zone 5a) wrote:

Protocol has been an eye catcher for everyone visiting my garden this spring before the Tall Beardeds have begun to bloom. Several visitors have remarked how much they like it. I have to say, I do to. It has the form of a Tall Bearded, but not the size -- an early beauty! Didn't bloom the first year, but bloomed profusely the second year.


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

American Iris Society Awards: Honorable Mention 1998; Award of Merit 2000; Hans and Jacob Sass Medal 2002