Siberian Iris
Iris sibirica 'Butter and Sugar'

Family: Iridaceae (eye-rid-AY-see-ee) (Info)
Genus: Iris (EYE-ris) (Info)
Species: sibirica (sy-BEER-ah-kuh) (Info)
Cultivar: Butter and Sugar
Hybridized by McEwen
Registered or introduced: 1976
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Class:

Siberian (SIB)

Height:

24-36 in. (60-90 cm)

Spacing:

12-15 in. (30-38 cm)

15-18 in. (38-45 cm)

18-24 in. (45-60 cm)

Hardiness:

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)

Sun Exposure:

Full Sun

Danger:

Parts of plant are poisonous if ingested

Bloom Color:

Pale Yellow

White/Near White

Bloom Time:

Midseason (M)

Foliage:

Herbaceous

Smooth-Textured

Other details:

Average Water Needs; Water regularly; do not overwater

Flowers are good for cutting

Soil pH requirements:

5.1 to 5.5 (strongly acidic)

5.6 to 6.0 (acidic)

6.1 to 6.5 (mildly acidic)

Patent Information:

Non-patented

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

Morgan-Wood Medal (SIB)

Regional

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

Plainfield, Illinois

Durham, Maine

South China, Maine

Beverly, Massachusetts

Wayland, Massachusetts

Deer River, Minnesota

Elk River, Minnesota

Wyoming, Minnesota

Auburn, New Hampshire

Portsmouth, New Hampshire

Hilton, New York

Concord, North Carolina

Coshocton, Ohio

Lewis Center, Ohio

Mount Hood Parkdale, Oregon

Norristown, Pennsylvania

Pittsburgh, Pennsylvania

Greeneville, Tennessee

Montpelier, Vermont

Portsmouth, Virginia

Madison, Wisconsin

Waterloo, Wisconsin

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Gardeners' Notes:

1
positive
2
neutrals
0
negatives
RatingContent
Neutral

On Mar 11, 2015, coriaceous from ROSLINDALE, MA wrote:

This was a breakthrough in its time, but 40 years later many better yellow Siberians have been hybridized---see, for example, the 2014 Morgan-Wood medal winner 'Tree of Songs'. http://wiki.irises.org/bin/view/Sib/SibTreeOfSongs

Positive

On Jan 27, 2009, Mainer from Durham, ME (Zone 3a) wrote:

Very hardy and the first amenoea to be hybridized of white and yellow in a siberian type iris.

Neutral

On Dec 22, 2005, Joan from Belfield, ND (Zone 4a) wrote:

Awards: American Iris Society Honorable Mention '78, Award of Merit '81, Morgan-Wood Medal '86