Photo by Melody

PlantFiles: Louisiana Iris
Iris 'Southdowns'

Family: Iridaceae (eye-rid-AY-see-ee) (Info)
Genus: Iris (EYE-ris) (Info)
Cultivar: Southdowns
Hybridized by O'Connor; Year of Registration or Introduction: 1993

» View all varieties of Iris

Louisiana (LA)

24-36 in. (60-90 cm)

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

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)
USDA Zone 9b: to -3.8 C (25 F)

Sun Exposure:
Full Sun
Sun to Partial Shade

Parts of plant are poisonous if ingested

Bloom Color:
Light Blue
White/Near White

Bloom Time:
Extra early (EE)


Other details:
Requires consistently moist soil; do not let dry out between waterings
Very high moisture needs; suitable for bogs and water gardens
Flowers are good for cutting

Soil pH requirements:
5.6 to 6.0 (acidic)
6.1 to 6.5 (mildly acidic)
6.6 to 7.5 (neutral)

Patent Information:
Unknown - Tell us

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):
Unknown - Tell us

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By dmj1218
Thumbnail #1 of Iris  by dmj1218

By dmj1218
Thumbnail #2 of Iris  by dmj1218

By dmj1218
Thumbnail #3 of Iris  by dmj1218

By vossner
Thumbnail #4 of Iris  by vossner

By vossner
Thumbnail #5 of Iris  by vossner

By BlissfulGarden
Thumbnail #6 of Iris  by BlissfulGarden


2 positives
No neutrals
No negatives

Gardeners' Notes:

Positive vossner On Mar 26, 2012, vossner from Richmond, TX (Zone 9a) wrote:

My rhizomes were planted in Fall 2010 and didn't do much the following spring and summer when we had above normal heat. It went into self-preservation mode by going dormant. With the nice rains of of late 2011/early 2012, it has come back w/ a vengeance.

Positive dmj1218 On Jul 25, 2006, dmj1218 from west Houston, TX (Zone 9a) wrote:

Upon opening, the petals are a web of fine purple veins over white suffusion. Quickly fades to ice blue. Styles creamy white; orange spear signal; height 38"; early season blooms, vigorous grower.

A really nice "ice blue" LA Iris!


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

Cordele, Georgia
Baton Rouge, Louisiana
Houston, Texas
Richmond, Texas

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