Tall Bearded Iris 'Prospero'


Family: Iridaceae (eye-rid-AY-see-ee) (Info)
Genus: Iris (EYE-ris) (Info)
Cultivar: Prospero
Hybridized by Yeld
Registered or introduced: 1920
» View all varieties of Iris


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

Bloom Color:

Fuchsia (red-purple)


Bloom Time:

Late Midseason (MLa)



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):

Historic/Retired Awards No Longer Distributed (See Comments)

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:

Fort Wayne, Indiana

Concord, North Carolina

Gardeners' Notes:


On Dec 3, 2013, themikesmom from Concord, NC wrote:

'PROSPERO' [(Sambucina) x (Amas)] Yeld, George R. 1920
TB ML Season Bloomtime 48" Tall Scapes. This is such a Beautiful, Stately and Regal looking Old Blue and Lavender Bi-tone from the Ancient Pre 1929 Class. A British Iris. We recieved Prospero, in March 2013, and it bloomed for us just 2 months later in May, without even really being Established, which means it is Amazingly Hardy! We recieved PROSPERO from Mary at IrisGal.com in Marcellus, New York, near the Beautiful Finger Lakes. If anyone else is interested in getting this lovely iris.
PROSPERO, was created by George Yeld 1843-1938, He was a Schoolmaster from York, England where he taught for many years, initially an amateur breeder in his spare time, he became a Master Iris breeder, who later, became the first Pr... read more


On May 29, 2011, LauraSteele from Fort Wayne, IN wrote:

Historic iris. Award of Merit 1920, Royal Hort. Society Award 1920. This iris is said to have a sweet vanilla fragrance. The only source I've found for this iris is Argyle Acres Iris in Argyle, TX.
From the 1928 Lee R. Bonnewitz Iris and Peony catalog of Van Wert, Ohio:
PROSPERO (Yeld). This is, in our estimation, one of the very best Irises in cultivation. It is healthy, tall, vigorous, of good growing habit, and we think also, very beautiful. It is a blended violet bicolor, with smoothly rounded falls, and it is in a class with ASIA both in color and shape. Standards are pale lavender flushed yellow at base, falls red-purple with light shading at margin, 40 to 48 inches. $1.00