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PlantFiles: Tall Bearded Iris
Iris 'Blenheim Royal'

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Family: Iridaceae (eye-rid-AY-see-ee) (Info)
Genus: Iris (EYE-ris) (Info)
Cultivar: Blenheim Royal
Hybridized by Schreiner; Year of Registration or Introduction: 1990

» View all varieties of Iris

7 members have or want this plant for trade.

Class:
Tall Bearded (TB)

Height:
36-48 in. (90-120 cm)

Spacing:
12-15 in. (30-38 cm)
15-18 in. (38-45 cm)
18-24 in. (45-60 cm)

Hardiness:
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

Danger:
Parts of plant are poisonous if ingested
Handling plant may cause skin irritation or allergic reaction

Bloom Color:
Medium Blue

Bloom Time:
Midseason (M)

Foliage:
Herbaceous

Other details:
Average Water Needs; Water regularly; do not overwater

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:
Non-patented

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

Click thumbnail
to view:

By Nancymo
Thumbnail #1 of Iris  by Nancymo

By laurief
Thumbnail #2 of Iris  by laurief

By laurief
Thumbnail #3 of Iris  by laurief

By laurief
Thumbnail #4 of Iris  by laurief

By rwbigfoot
Thumbnail #5 of Iris  by rwbigfoot

By pajaritomt
Thumbnail #6 of Iris  by pajaritomt

By PaintedAcres
Thumbnail #7 of Iris  by PaintedAcres

There are a total of 9 photos.
Click here to view them all!

Profile:

3 positives
1 neutral
No negatives

Gardeners' Notes:

RatingAuthorContent
Positive pajaritomt On Jul 28, 2007, pajaritomt from Los Alamos, NM (Zone 5a) wrote:

I have been growing Blenheim Royal for some years. It has endured much mistreatment and kept right on blooming. My neighbors always ooh and aah over it. I think it is a wonderful shade of blue, developing a purple tinge in a day or so, that I find very intriguing.

Neutral Joan On Nov 19, 2006, Joan from Belfield, ND (Zone 4a) wrote:

Awards: Honorable Mention 1992, Award of Merit 1994

Positive rediris On Feb 5, 2004, rediris from Billings, MT wrote:

very prolific with several blooms on each stock.

Positive laurief On Oct 20, 2003, laurief from Deer River, MN (Zone 3b) wrote:

Very few tall beardeds (TBs) can survive my growing conditions. This northern MN zone 3b climate inflicts severe, extended cold during the winter months, often with little snow cover for insulation. Summer temps can exceed 90 degrees F. My soil is very heavy, compacted clay with a slightly acid pH. 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, when provided at all. Most TBs here are growing with less than 6 hrs of sun per day, so growth and bloom are not what they could be under full sun conditions. I have lost hundreds of weaker TB cultivars over the years, so the few that have managed to survive are worthy of high praise.

BLENHEIM ROYAL takes the worst my growing conditions can dish out and blooms reliably in spite of it all, year after year. It's my only TB growing in the main clay beds that has never missed a year of bloom. Amazing! It's got very good blue color with minimal lavender hue, though I wouldn't call it a "true blue". I highly recommend this cultivar.

Laurie

Regional...

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

Tuscaloosa, Alabama
Arbuckle, California
Yosemite Lakes, California
Lexington, Kentucky
Deer River, Minnesota
Isle, Minnesota
Marble Hill, Missouri (2 reports)
Weatherby, Missouri
Billings, Montana
Harlowton, Montana
Los Alamos, New Mexico



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