Dietes Species, African Iris, Cape Iris, Fortnight Lily, Morea Lily, Wild Iris

Dietes iridioides

Family: Iridaceae (eye-rid-AY-see-ee) (Info)
Genus: Dietes (dy-AY-teez) (Info)
Species: iridioides (ir-id-ee-OY-deez) (Info)
Synonym:Moraea iridioides
View this plant in a garden



Water Requirements:

Average Water Needs; Water regularly; do not overwater

Sun Exposure:

Full Sun



Foliage Color:

Medium Green


18-24 in. (45-60 cm)


12-15 in. (30-38 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)

Where to Grow:

Grow outdoors year-round in hardiness zone

Suitable for growing in containers


Parts of plant are poisonous if ingested

Handling plant may cause skin irritation or allergic reaction

Bloom Color:

Pale Yellow

Light Blue

White/Near White

Bloom Characteristics:

Unknown - Tell us

Bloom Size:


Bloom Time:

Late Spring/Early Summer

Mid Summer

Other details:

Unknown - Tell us

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:


Propagation Methods:

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

From seed; direct sow after last frost

Self-sows freely; deadhead if you do not want volunteer seedlings next season

Seed Collecting:

Allow seedheads to dry on plants; remove and collect seeds


This plant is said to grow outdoors in the following regions:

Foley, Alabama

Mobile, Alabama

Phoenix, Arizona

Alameda, California

Amesti, California

Arroyo Grande, California

Beaumont, California

Canoga Park, California

Casa de Oro-Mount Helix, California

Castro Valley, California

Corralitos, California

Cotati, California

Delano, California

Duarte, California

Elk Grove, California

Elkhorn, California

Encinitas, California

Fallbrook, California(5 reports)

Fremont, California

Highland, California

Interlaken, California

Irvine, California

Lake Forest, California

Long Beach, California

Manhattan Beach, California

Monterey, California

Moreno Valley, California

Mountain View Acres, California

Oak View, California

Pajaro, California

Redding, California

San Diego, California(3 reports)

San Francisco, California

Santa Ana, California

Santa Barbara, California

Thousand Oaks, California

Tulare, California

Vallejo, California

Venice, California

Ventura, California

Vista, California(9 reports)

Watsonville, California

Wildomar, California

São Mateus, Espírito Santo

Bradley, Florida

Brandon, Florida

Deltona, Florida

Eustis, Florida

Fort Lauderdale, Florida

Fort Pierce, Florida

Gainesville, Florida

Hobe Sound, Florida

Hollywood, Florida(2 reports)

Macclenny, Florida

Oldsmar, Florida

Orange Springs, Florida

Orlando, Florida

Pompano Beach, Florida

Port Charlotte, Florida

Riverview, Florida

Sarasota, Florida

Sebring, Florida

Tampa, Florida

Tarpon Springs, Florida

Umatilla, Florida

Venice, Florida

Vero Beach, Florida

Zephyrhills, Florida(2 reports)

Kapaa, Hawaii

Wailua Homesteads, Hawaii

Hammond, Louisiana

Carriere, Mississippi

Saint Joseph, Missouri

Elizabeth City, North Carolina

Brookings, Oregon

Harbor, Oregon

Beaufort, South Carolina

Bluffton, South Carolina

Columbia, South Carolina(2 reports)

Conway, South Carolina

Hilton Head Island, South Carolina

Johns Island, South Carolina

Ladys Island, South Carolina

Lexington, South Carolina

Saint Helena Island, South Carolina(2 reports)

Sumter, South Carolina

Austin, Texas

Centerville, Texas

Mc Kinney, Texas

New Waverly, Texas

Port Isabel, Texas

San Antonio, Texas

Spring, Texas

show all

Gardeners' Notes:


On May 27, 2013, GardenGoddess57 from Orlando, FL wrote:

Beautiful flowers, like white origami birds! Forms large clumps over time that need to be divided and spread out. Not at all invasive in my central FL area.


On Mar 8, 2013, Domehomedee from Arroyo Grande, CA (Zone 9a) wrote:

I like fortnight lily. The flowers are beautiful and to me they are low maintenance. You do have to clean up any dead leaves and trim back the flower stalks, I do this like once a year. I don't see them as weedy, not at all, but I am in an area that's not humid so they don't multiply all that fast. I do get some volunteer seedlings though. They are not as light picky as most plants and are happy in full sun and part shade, I see this a real positive living in a canyon.


On Jun 9, 2012, humanbackhoe from Lincoln, CA wrote:

This plant is very invasive. Read rosevilles comment but I did not want to work in mud, so instead I used a 14lb. digging pry bar with a 4x4 block to work up the root ball going around the base. However there are a lot of runners. Does anyone know how to erraticate the runners, will round up do it?


On Jun 8, 2012, handywoman from San Mateo, CA wrote:

I planted about 80 1-gallon containers that I had propagated in McMinnville, OR. USDA says it is Zone 8 and the plants should be able to survive. But after several months in the ground, they either don't like the heavy soil, or the ample rain, or the cold winter because almost all the foliage died off and all I have left are short bursts of growth (about 3 - 4" high) in the center of the plants. My mother had some in Woodburn, OR and they seemed to do fine. Not so in McMinnville. Any McMinnville gardeners out there with suggestions for a low maintenance perennial that looks great in large beds? And that, as a bonus, might be able to suppress laurel?!


On May 26, 2010, Kiyzersoze from Coral Springs, FL (Zone 10b) wrote:

I love this plant. It tolerates our heat, had no problem with the low 40's and it is almost always in bloom in our area. Have not had a problem with it being invasive.


On May 12, 2010, CAwinediva from Anaheim, CA wrote:

2 years ago I planted a few seeds from a pod I found. Now these have invaded all our flower beds. Between roses, iris and other plants. They are very hard to remove, though we will try the methode mentioned above, using an ax. They are really pretty when they bloom, and that's fairly often here in So. Cal. But I would NEVER plant those seeds again!!!


On Mar 16, 2007, Airel_Ice from Arlington, TX wrote:

I just bought mine, I plan on planting it with some grasses. Does anyone have a photo of the plant on a larger scale. I would like to see the whole plant not just the flowers. I am excited to see it will be easy to propagate either by seeds or dividing.. I like getting more than one plant for my buck! :D


On May 20, 2006, Buttoneer from Carlisle, PA (Zone 6b) wrote:

I grew this plant from seed 5 years ago. Today, 5/20/06, it is blooming for the first time in my greenhouse in Central PA. Quite impressive. It didn't bloom, however, until after I had potted it up to a larger pot.


On Apr 17, 2006, gypsy98706013 from Spring, TX (Zone 8b) wrote:

It's proven itself to be TX heat tolerant. Although it seems to do better when protected by trees. It grows well right up against all my trees, including pine trees. I collected a ton of dried seed pods last fall but still havn't figured out how to get them started, meanwhile i have a few new ones sprouting all on their own. I havn't divided them yet (2 seasons) but I will in fall. Overall, low maintenance with good payoff.


On Sep 19, 2005, snagglebuddy from Riverview, FL (Zone 9b) wrote:

These were planted when the house was built. For best growth, they should be pulled up and divided regularly. If not they will get huge and the bottom leaves will turn brown. I have noticed lots of babies that I have been giving away. The flowers are pretty. I will try to stop them from spreading seed everywhere again. They are nice, but I don't want tons of them.


On Aug 15, 2005, michaeladenner from Deland, FL wrote:

Sturdy, ultra-low maintenance plant here in Central Florida. It grows rapidly -- even very small, one-gallon plants grow within three years to 2-3' or more in diameter.
Grows best in filtered light here in FL (direct sun farther north), but I have it in full direct sunlight in the swale and it's doing well in those tough conditions, though the leaves are not as deep green. Flowers best in sun, but even in full shade it flowers and grows. Blooms in flushes, with large flowers in the cool season and smaller ones when it's hot. Makes a beautiful cut flower, though lasts only one day.
It does self-sow, but the seedlings are easy to recognize and shallow-rooted.
Note: These plants, when large, are VERY difficult to dig and divide. I have dug and divided monster clums of ... read more


On May 6, 2005, sterhill from Atlanta, GA (Zone 7b) wrote:

I think this is a lovely flower but it has proved too cold in my Atlanta garden for it. I raised 12 plants from seed. They were good sturdy plants and were very full this fall (no flowers yet) but only one survived the winter, and it is very small with one or two leaves. I had planted two nursery plants but they did not survive either.

Maybe I'll try in my back garden where it is more protected and confine them to pots that can live in the garage in the winter.


On Oct 11, 2004, rocksprout from Roseville, CA wrote:

They look great initially. They do well with very little water and tolerate full sun. But they must be trimmed back at the root. Otherwise they spread, growing in diameter and in density.

To remove them: cut them down to about 3" from the ground. Soak them with water to loosen the roots in the ground. Then, with a pick axe, loosen the roots all around and in the center. Then, you can shake them out of the ground with the pick axe that is driven into the center of the plant. Whole bunches of roots come out when you shake them out this way, saving lots of time.


On Oct 6, 2004, FullertonCA from Lake Arrowhead, CA wrote:

I removed a lawn and planted the area with Dietes iridioides (or, I "thought" I had removed the lawn). Although I'm impressed by the hardiness of dietes, the bermuda grass coming up through the middle of the tight dietes clumps has been nearly impossible to weed. I'm hoping to find a spray that kills the bermuda, but not the dietes.

Other than the bermuda problem, this plant has performed beautifully year round.


On Aug 27, 2004, pokerboy from Canberra,
Australia (Zone 8b) wrote:

This is a very drought tolerant plant once established. Forms clumps of attractive evergreen foliage. Great flowers. A good plant to try. pokerboy.


On Jun 30, 2004, Jamespayne from Sebring, FL (Zone 9b) wrote:

The flowers of the Dietes Vegata have pastel stripes that look like they were hand painted on the white flowers. Also called the fortnight lilly because it blooms in two week intervals, this is a very hardy plant, especially in areas that experience periods of drought. I have seen them growing wild on the banks of the Kissimee River in Florida, zone 9a.


On May 6, 2004, angelam from melbourne,
Australia wrote:

I really like this plant.I think the flowers are lovely and the green blade like leaves make attractive clumps. It does self seed but as removing seed pod will increase flowering I don't find it a problem. The seed heads take quite a time to ripen so it is just a job for doing when passing.
I've had cause to lift and split a couple of large clumps in recent times. Well rooted pieces went straight back into the ground. Pieces with little or no roots went into ordinary potting compost. All the pieces in the potting compost survived. The newly split pieces are the only ones I've found needing water. Established clumps seem very drought tolerant.


On Oct 12, 2003, PotEmUp from Fremont, CA (Zone 9a) wrote:

Beautiful flowers, nice blade like structure, almost continuous flowering. Self seeds easily, but the new plants are very shallow rooted and easy to pull. My cyclamen and callas have self seeded as much or more than this plant and I sure won't give them up.


On Oct 12, 2003, jermainiac from Seattle, WA (Zone 8a) wrote:

Agree on the weediness. These are planted in parking lots to provide quick growth. I had one. Split it into 2 when it got big. They are both ready to split now.

I thought I had all these baby glads coming up everywhere. Cool, I thought. I felt the foliage after I noticed it wasn't dying back. Lots of dietes plants!!! I'm yanking them all up this winter!

The seeds are very pretty, dark mahogany in color, smooth texture, shaped a little like small Indian Corn kernals.


On Oct 1, 2003, TerriFlorida from Plant City, FL wrote:

I've had no trouble with this plant, it stays where it is put and behaves -- but then, Florida is a high rainfall state, and the southwest is not. The plant probably goes to where there is water, roses would be a prime candidate. It is not very drought tolerant. Perhaps where it is invasive but is still wanted, it should be container grown.


On Jul 11, 2003, astanton from Anaheim, CA (Zone 10b) wrote:

In Southern California, this plant is extremely weedy; completely out of control. It evades every single bush--roses and Bird of Paradise included--and starts its growth in the middle of the bush, which makes it very difficult, if not impossible, so remove it. I have rose bushes with five or six Dietes growing through it! Very invasive plant.


On Sep 6, 2001, justmeLisa from Brewers, KY (Zone 6b) wrote:

This plant has iris-like flowers that are on perennial clumps of narrow bright green leaves. This is a very low maintenance plant that thrives on neglect.Each flower last only a day, but is quickly replaced by another. Bloom bursts seem to come in at 2 week intervals. Divide clumps in fall or winter.


On Jul 26, 2001, eltel from Macclesfield, CHESHIRE (Zone 8a) wrote:

A rhizomatous perennial from Southern Africa. Though listed as Zone 9 it has survived outside in my garden in Central England (European Zone 8), provided it gets plenty of protection (fallen leaves, straw etc..). However, they do best in frost free zones with dry summers.

Flowers (see picture) are followed by large elongated seed pods that are full of small, hard, black seeds. Easy to raise from seed, by careful division of large rhizomes, or by the offsets that are formed on the flower spike after flowering.