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PlantSnap
Plant Care
Fortnight lily
(Dietes iridioides)
Also Known As
Fortnight lily, African iris, Butterfly iris
About This Plant
Dietes iridioides is a rhizomatous perennial plant known for its sword-shaped leaves and white iris-like flowers. It is commonly referred to as African iris or butterfly iris.
Plant Care Instructions
Outdoor Size Range
24-48 inches (60-120 cm)
Light Requirements
Dietes iridioides prefers full sun to partial shade. It can tolerate some shade, but too much shade can reduce flowering.
Humidity Needs
Dietes iridioides prefers moderate humidity levels. It can tolerate some dryness, but too much humidity can lead to fungal diseases.
Fertilizing Schedule
Feed the plant with a balanced, slow-release fertilizer in the spring and summer months. Avoid fertilizing in the winter.
Pruning Guidelines
Remove spent flowers and dead leaves regularly to keep the plant looking neat and healthy. Cut back the foliage in the fall to encourage new growth in the spring.
Common Pests and Diseases
Dietes iridioides is relatively pest-free, but it can be susceptible to spider mites, thrips, and aphids. Treat infestations with insecticidal soap or neem oil.
Indoor Size Range
24-36 inches (60-90 cm)
Watering Schedule
Water the plant regularly during the growing season, but allow the soil to dry out slightly between waterings. Reduce watering in the winter months.
Temperature Range
This plant can tolerate a wide range of temperatures, from 25 to 100 degrees Fahrenheit (-4 to 38 degrees Celsius). However, it prefers temperatures between 60 and 80 degrees Fahrenheit (15 to 27 degrees Celsius).
Growing Season
The growing season for Dietes iridioides is from spring to fall.
Growing Difficulty Level
Dietes iridioides is an easy plant to grow, making it a great choice for beginners.
USDA Hardiness Zones
Dietes iridioides is hardy in USDA zones 8 to 11.
Did You Know?
Dietes iridioides is known for its ability to attract butterflies, which is why it is commonly referred to as butterfly iris.
