The Butterfly African Iris (Dietes grandiflora) is a striking perennial valued for its hardiness, repeat flowering, and versatility in both formal and naturalized garden settings. Native to South Africa, this iris brings long-lasting color and elegance to the garden, blooming from spring through fall with tall, upright spikes that produce large white blossoms adorned with yellow and purple centers. Its graceful, sword-like foliage provides year-round interest, making it ideal for borders, mixed perennial beds, mass plantings, or containers. This clumping, robust perennial has stiff leaves radiating up and out in a fan-shaped pattern.
This plant looks amazing as a groundcover, in a potted container, or in a rock or woodland garden. It has grass-like features and dainty flowers that allow it to stand its own in any garden. Plus, it is low maintenance which can be a plus for any busy gardener.
Dietes grandiflora flowers
Ideal Growing Conditions
The African iris will bloom best on rich, moist soil but will tolerate moderately dry soil conditions, growing in full sun to partial shade. Best flowering occurs in full sun, but the plant does best with some part light afternoon shade. Plants in the full sun or in sandy soil grow best with regular and frequent irrigation.
Dietes Bicolor - African Iris - Propagation by division of the African Iris/ Yellow Wild Iris
The flower spikes are topped with 3inch white flowers marked with yellow and blue. Although short-lived (about 2 days), the flowers are produced sporadically throughout the year, especially in spring and early summer.
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In the garden, the plants do best in moist, moderately fertile, well-drained soils in full sun to part shade. Plant in organically enriched, well-drained soil for the best performance.
Planting and Spacing
Mature plants reach 2 to 4 feet tall with a spread of about 2 to 3 feet. For perennial borders or mass plantings, space 3 feet apart, center to center. When grown in masses or used as a bedding plant, individual plants should be spaced approximately 14 inches apart. Butterfly African Iris is a fine choice for the garden, but it is also a good selection for planting in outdoor pots and containers.
Watering and Soil
Fortnight Lily tolerates drought and some soil dryness, but you should provide regular moisture. Water regularly until established, then reduce to occasional deep watering as this plant is more drought-tolerant than many other iris varieties. This plant prefers to grow in moist to wet soil, and will even tolerate some standing water. It is not particular as to soil type or pH.
Butterfly Iris Plant Care
Temperature and Hardiness
The plant is winter hardy in USDA zones 9 through 11, but can be injured when temperatures drop below 50 degrees F. (10 degrees C). Cold temperatures (below 25°F) cause leaf browning. These leaves can be removed in the spring to clean up the plant. In cooler climates it can be grown as an annual or you can dig up the rhizomes and store them indoors for winter. Potted plants can be brought indoors. Apply a layer of organic mulch in colder regions if extended freezes are expected.
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Maintenance and Upkeep
This plant will require occasional maintenance and upkeep. Otherwise, African iris requires no maintenance except for a light fertilization or two each year. Trim off the flower heads after they fade and die to encourage more blooms late into the season. You can prune the blossoms to reduce seed production.
Pest Control
Nematodes are the main pest problem.
Additional Considerations
This is a selected variety of a species not originally from North America, and parts of it are known to be toxic to humans and animals, so care should be exercised in planting it around children and pets. Deer don't particularly care for this plant and will usually leave it alone in favor of tastier treats. With its upright habit of growth, it is best suited for use as a 'thriller' in the 'spiller-thriller-filler' container combination; plant it near the center of the pot, surrounded by smaller plants and those that spill over the edges. It is even sizeable enough that it can be grown alone in a suitable container.
Butterfly African Iris is an herbaceous evergreen perennial with tall flower stalks held atop a low mound of foliage. Its attractive sword-like leaves remain dark green in color throughout the year.
The flower stalks can be weak and so it may require staking in exposed sites or excessively rich soils. It is somewhat tolerant of urban pollution.
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Warranty Information
Starting January 1, 2025 all bushes, perennials & trees purchased come with an extended 1-year warranty for added confidence. AK, HI. These restrictions apply only to this specific plant due to agricultural regulations or other limitations.
