Dutch Iris 'Delft Blue'

Iris x hollandica

Family: Iridaceae (eye-rid-AY-see-ee) (Info)
Genus: Iris (EYE-ris) (Info)
Species: x hollandica (hol-LAN-dee-kuh) (Info)
Cultivar: Delft Blue
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6-12 in. (15-30 cm)

12-18 in. (30-45 cm)


3-6 in. (7-15 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

Sun to Partial Shade


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Bloom Color:

Medium Blue

Dark Blue

White/Near White

Bloom Time:

Extra early (EE)

Midseason (M)



Other details:

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Soil pH requirements:

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Patent Information:

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Propagation Methods:

By dividing rhizomes, tubers, corms or bulbs (including offsets)

Seed Collecting:

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Awards (if applicable):

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Foliage Color:

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Bloom Characteristics:

Flowers are good for cutting

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:

Cottondale, Alabama

Jacksonville, Florida

Hahira, Georgia

Chicago, Illinois

Charleston, South Carolina

Vancouver, Washington

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Gardeners' Notes:


On Mar 25, 2009, graceful_garden from Hahira, GA (Zone 8b) wrote:

Gorgeous flowers, and they come back reliably with little care. I add bulb fertilizer once per year.


On Mar 31, 2005, JaxFlaGardener from Jacksonville, FL (Zone 8b) wrote:

This is my first year of growing this iris. I am VERY pleased with the color! Perfect for my bed of blue and white flowers. I will add a lot more as time and finances allow.


On Mar 30, 2005, DreamOfSpring from Charleston, SC (Zone 9a) wrote:

Described as having the same color as that of Delft Blue pottery. Incredibly, it really does. Mine look exactly like those shown in vendor photos.

However, flowers seem to fade much faster than other Dutch Iris varieties in my garden; seem to be easily damaged by heavy rains, etc.