Small Fortnight Lily
Dietes iridioides · Iridaceae
📷 Amada44 · Public domain
The gardener's calendar
Ideal time to plant small fortnight lily: set it out when the soil is neither frozen nor waterlogged, and water generously as it establishes.
ID card
- Common name
- African Iris
- Family
- Iridaceae
- Plant type
- Herbaceous perennial
- Foliage
- Evergreen, linear and slender
- Flowering
- May to August, yellow and white flowers
- Adult height
- About 80 cm
- Hardiness
- Tender, grow in mild climates or in moveable containers
- Origin
- South Africa
✓ Taxonomy verifiedSource: AI estimate · hardiness: reliability medium.
Expert tips
The key tip
This rhizome-free African iris demands impeccable drainage: grow it in a wide pot with highly draining mix (soil + sand + gravel). Fleshy roots rot quickly if the soil stays wet in winter.
The common mistake
Planting in heavy soil or watering too regularly in winter: root rot is common.
The pro's trick
Divide the clumps every 4 years in April to multiply and rejuvenate the plants.
Care
Light and exposure
Your African Iris needs full sun for generous, long-lasting blooms. At least 6 hours of direct sunlight daily are essential. In very hot climates, a bit of afternoon shade can prevent summer wilting.
Watering
Water needs are moderate. Water regularly during growth and flowering, allowing the soil to dry slightly between waterings. In winter or dry climates, reduce watering. Avoid standing water, which promotes rhizome rot.
Soil and planting
Well-draining soil is essential: opt for a light mix with sand or pumice. The plant tolerates poor to moderately fertile soils. In pots, use Mediterranean plant-specific potting mix or a soil-sand blend.
Fertilizing
Apply balanced, diluted fertilizer every 15 days during the growing season (spring-summer). Stop fertilizing in fall and winter. Avoid excess nitrogen, which favors foliage at the expense of flowers.
Pruning and maintenance
Remove spent flowers regularly to extend blooming. Eliminate dried or damaged leaves at their base. After winter, light cleanup of dead foliage keeps the plant compact and well-aerated.
Pests and diseases
African Iris is generally robust. Watch for mealybugs indoors. Excessive humidity can promote fungal rot: maintain good air circulation. Overwatering during dormancy is the main risk.
Did you know?
Dietes iridioides is nicknamed 'African Iris' although it's not a true iris in the strict botanical sense: it's a distant relative within the large Iridaceae family. Native to South Africa's coastal zones, it has conquered Mediterranean and subtropical gardens thanks to its drought resistance and graceful form. Its pale yellow flowers with white centers were once prized in traditional South African floral arrangements.
Where to buy it
Plant in spring or early autumn, avoiding spells of intense heat. Pick a plant with healthy foliage and roots that are not exposed. Best time: March, April, May, September.
Add this plant to my garden →Plants from the same family
- Early crocusCrocus tommasinianus
- Narrow-leaved blue-eyed grassSisyrinchium angustifolium
- Tiger irisIris domestica
- Fringed irisIris japonica
- Japanese irisIris ensata
- Snow CrocusCrocus chrysanthus
Tips generated and checked by Viridia — adapt them to your local climate.