Photo by Melody

PlantFiles: Butterfly Iris, Wild Iris
Dietes grandiflora

Family: Iridaceae (eye-rid-AY-see-ee) (Info)
Genus: Dietes (dy-AY-teez) (Info)
Species: grandiflora (gran-dih-FLOR-uh) (Info)

One vendor has this plant for sale.

13 members have or want this plant for trade.


36-48 in. (90-120 cm)
4-6 ft. (1.2-1.8 m)

18-24 in. (45-60 cm)

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)
USDA Zone 11: above 4.5 C (40 F)

Sun Exposure:
Sun to Partial Shade

Unknown - Tell us

Bloom Color:
Pale Yellow
White/Near White

Bloom Time:
Mid Spring
Late Spring/Early Summer


Other details:
Drought-tolerant; suitable for xeriscaping
This plant is attractive to bees, butterflies and/or birds

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)
From seed; direct sow after last frost

Seed Collecting:
Allow seedheads to dry on plants; remove and collect seeds
Properly cleaned, seed can be successfully stored

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There are a total of 19 photos.
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4 positives
No neutrals
1 negative

Gardeners' Notes:

Positive cat_bear On Jul 5, 2013, cat_bear from Timberwood Park, TX wrote:

I love this plant because it is something with a beautiful bloom that the voracious deer in my neighborhood won't eat. My plants had a hard time coming back after a very cold San Antonio winter, so I bought more to add to the bed. The containers were large, so I divided each into three plants, which did not bother the iris at all. Now they have been growing beautifully for several years, but have slowed down a little in their blooming. I tried cutting into the plant with a sharp shovel and replanting bits of the plant in other areas of the yard in sun, shade and part shade areas as an experiment. Will report back with my results.

Positive txlady On Feb 27, 2009, txlady from Houston, TX (Zone 10b) wrote:

I had never seen this plant before until I saw it at my office in our beds. I happened upon the landscaper one afternoon and talked him into giving me a piece because he was thinning it out. I planted it and by the next spring it was huge! I divided it into 4 plants and spead them around. This year all over town they are blooming beautifully, but not mine. Does anyone know what to feed them? Bulb food? Flower blooming fertilizer? I have put compost around them every year for 3 years, but not yet this year.

Negative passionflower2 On Apr 23, 2008, passionflower2 from Longview, TX wrote:

I have planted these iris in full sun, they are in very good soil conditions and watered regularly, yet did not come back after the winter weather like the Louisiana swamp iris did. Very sparsely leaved and no blooms. No sign of disease or insects. I probably have twenty 3-gallon plants.

Positive loves2dig On Jun 12, 2006, loves2dig from Sacramento, CA wrote:

This plant is grown in Zone 9 California,
It is very popular in commercial applications, as well as home landscape.
It grows larger here width/height 3'-4' seems to be pest free,( but dosen't do well with alot of water), it's drought tolorent. I'm planting it now on the eastern facing side of the house in full sun, late afternoon shade, to hide the air conditioning unit. I will be dividing this plant into 4 sections. update to follow
Thanks, Sherry

Positive snuzi On May 22, 2006, snuzi from Belle Rose, LA wrote:

This plant does great no matter where its planted in this zone..However it does its best when it gets partial sun and is in cool moist area. Makes a beautiful side dressing near a pond due to the humidity. Easily divided with spade. I have propagated by seed, germinates easier indoors in a mini-greenhouse using moist peat mixture expandable pods.


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

Glendale, Arizona
Long Beach, California
Moreno Valley, California
Oceanside, California
San Francisco, California
San Jose, California
San Leandro, California
Stockton, California
Bokeelia, Florida
Jacksonville, Florida
Lecanto, Florida
Orlando, Florida
Tampa, Florida
Umatilla, Florida
Belle Rose, Louisiana
Doyline, Louisiana
Sulphur, Louisiana
Las Vegas, Nevada
Alice, Texas
Austin, Texas
Corpus Christi, Texas
Galveston, Texas
Houston, Texas (3 reports)
Humble, Texas
Mansfield, Texas
Navasota, Texas
San Antonio, Texas
Spring, Texas
Sugar Land, Texas (2 reports)

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