African Iris, Butterfly Iris, Fortnight Lily
- spp. (White or yellow flowers)
- A. Flowering Characteristics
- Dietes spp. starts flowering in mid-spring (April)
for several weeks. Plants are about 24-48 inches tall.
- B. General Characteristics
- 1. Origin of species: Australia, Tropical and Southern
- 2. Common names: African Iris, Butterfly Iris, Fortnight
- 3. Geophyte organ: Fibrous or woody rhizomes
- 4. Hardiness type: Tender III - Injured at temperatures
below 35 degrees F (2C) when planted.
- 5. Natural reproductive systems and growth and development
requirements: Reproduces by rhizomes growth and seeds and requires a warm
(68 to 75F) - cool (40 to 55F) - warm (68 to 75F) annual thermoperiodic
- 6. Primary uses: Beds, borders, containers, rock gardens,
and woodland gardens.
- C. Cultural Information
- 1. Bulb sizes: Number 1
- 2. Planting density: 12 inches apart, 1 per sq. ft.
- 3. Planting depth: Cover crown with 1 inch of soil.
- 4. Planting time: Fall or spring
- 5. Climatic zone habit: 1990 USDA Climatic Zone 8 with
mulch, Zones 9 to 10 without mulch.
- 6. Light requirements: Full sunlight only.
- 7. Moisture: Tolerates some drought, but requires moisture
when in flower
- 8. Animal susceptibility: Not reported
- D. Companion Plants:
- Achillea, Carex, Crocosmia, Echinacea, Lavendula,
Stachys, Sedum, Spiraea spp., Pittosporum.
Holland Technical Service Bulletin Number 31 was prepared for the WWW system
by A.A. De Hertogh, L.B. Gallitano, M.E. Traer, and A.B. Russell, Department
of Horticultural Science, NC State University. The information was obtained
not only from original research conducted by the authors but also from databases
released by other sources. This Bulletin was published by the International
Flower Bulb Center (IBC), Hillegom, the Netherlands on behalf of the Dutch Flower
Bulb Industry. Because of the various climates in North America and year-to-year
variability of the weather, the IBC cannot and does not accept responsibility
for divergent results that may arise using information obtained from this document
or site. Photographs copyright @1997 by A.B. Russell and A.A. De Hertogh. Computer
programming by Miguel Buendia, graphics by Brad Capel.