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PlantFiles: Yellow Flag Iris, Yellow Iris, Water Flag Iris
Iris pseudacorus 'Roy Davidson'

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Family: Iridaceae (eye-rid-AY-see-ee) (Info)
Genus: Iris (EYE-ris) (Info)
Species: pseudacorus (soo-DA-ko-rus) (Info)
Cultivar: Roy Davidson
Hybridized by B. Hager; Year of Registration or Introduction: 1987

» View all varieties of Iris

Class:
Louisiana (LA)
Species

Height:
24-36 in. (60-90 cm)

Spacing:
12-15 in. (30-38 cm)
15-18 in. (38-45 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)
USDA Zone 9b: to -3.8 C (25 F)
USDA Zone 10a: to -1.1 C (30 F)
USDA Zone 10b: to 1.7 C (35 F)

Sun Exposure:
Full Sun

Danger:
Parts of plant are poisonous if ingested

Bloom Color:
Bright Yellow
Brown/Bronze

Bloom Time:
Extra early (EE)
Midseason (M)
Late Midseason (MLa)

Foliage:
Herbaceous

Other details:
May be a noxious weed or invasive
This plant is attractive to bees, butterflies and/or birds
Very high moisture needs; suitable for bogs and water gardens

Soil pH requirements:
5.6 to 6.0 (acidic)
6.1 to 6.5 (mildly acidic)
6.6 to 7.5 (neutral)
7.6 to 7.8 (mildly alkaline)

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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to view:

By raysplants
Thumbnail #1 of Iris pseudacorus by raysplants

By flowerfrenzy
Thumbnail #2 of Iris pseudacorus by flowerfrenzy

By Lilypon
Thumbnail #3 of Iris pseudacorus by Lilypon

By Kell
Thumbnail #4 of Iris pseudacorus by Kell

Profile:

No positives
2 neutrals
1 negative

Gardeners' Notes:

RatingAuthorContent
Negative Jasmine6 On Jun 6, 2011, Jasmine6 from Mathews, VA wrote:

Just don't plant this where it can get away from you!! I planted a couple near my marsh in Virginia, and it has almost completely taken over, muscling out the cattails and other native plants. Pretty flower, but I'm sorry I ever saw it.

Neutral Joan On May 17, 2007, Joan from Belfield, ND (Zone 4a) wrote:

Roy Davidson is an Apogon hybrid. Holden Clough open pollinated

Neutral dmj1218 On May 27, 2006, dmj1218 from west Houston, TX (Zone 9a) wrote:

Bright yellow flowers, with some veining and dark brown crescent signals, blooms on branched stems. Foliage is a lush green all summer long. Tall, vigorous grower.

Regional...

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

San Leandro, California
Mathews, Virginia
Vancouver, Washington



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