Lord Howe Island Iris Plant Care
Dietes robinsoniana Klatt
Updated · Sources · How we source care data
Dietes robinsoniana, the Lord Howe wedding lily, is found naturally only on Lord Howe Island, Australia. It grows on cliff faces, often in exposed locations.
Every 7–10 days
Full sun to partial shade
50–85°F
40–70%
At a glance
How do you care for Lord Howe Island Iris?
Water Lord Howe Island Iris every 7–10 days, letting the top layer of soil dry out between waterings, and give it full sun to partial shade. It prefers temperatures of 50–85°F (10–29°C) and 40–70% humidity. Fertilize it every 6 months during the growing season. It is reported as toxic to pets, so keep it out of reach of pets.
What Is the Lord Howe Island Iris?
Lord Howe Island Iris (Dietes robinsoniana) belongs to the Iridaceae family within the Dietes genus. Lord Howe Island Iris is also known as St. Catherine's Flower.
Lord Howe Island Iris displays a clumping perennial growth habit, reaching up to 3 ft tall with a spread of approximately 2 ft. Lord Howe Island Iris produces white iris-like flowers with yellow and blue markings.
Leaf size: approximately 18 inches.
How Often Should You Water a Lord Howe Island Iris?
Dietes robinsoniana requires watering every 7–10 days. Allow the top layer of soil to dry between waterings to prevent root rot. Reduce watering frequency during winter when growth slows.
Watering Frequency
Every 7–10 days
Let soil partially dry between waterings
What Light Does the Lord Howe Island Iris Need?
Lord Howe Island Iris thrives in full sun to partial shade.
Light Requirement
Full sun to partial shade
What Temperature and Humidity Does the Lord Howe Island Iris Prefer?
Dietes robinsoniana grows best at temperatures of 50–85°F. Lord Howe Island Iris prefers humidity levels of 40–70%.
Temperature
50–85°F
Humidity
40–70%
What Soil Mix Works Best for a Lord Howe Island Iris?
Well-draining sandy soil with added compost for extra nutrients. Good drainage is essential for Lord Howe Island Iris to prevent waterlogging, which leads to root rot and fungal issues.
How Often Should You Fertilize a Lord Howe Island Iris?
Feed Lord Howe Island Iris every 6 months during the growing season (spring and summer) with a balanced fertilizer diluted to the strength on the label.
Pause feeding in autumn and winter, when growth slows, and never fertilize dry soil — water first.
Fertilizing
Every 6 months
During the growing season
The PlantoScan app can remind you when to water and when to fertilize each plant.
How Do You Repot a Lord Howe Island Iris?
Repot every 2-3 years in spring. Choose a pot one size larger than the current container, and ensure it has drainage holes to allow excess water to escape.
How Do You Propagate a Lord Howe Island Iris?
Lord Howe Island Iris can be propagated through division of rhizomes, seeds. Similar propagation techniques also apply to african iris plant care, which shares the same genus.
Is the Lord Howe Island Iris Toxic to Pets and Children?
Toxic (caution)
Reported as toxic in our plant data. Not verified by the ASPCA.
This is a general caution, not veterinary or medical advice. If your pet ate a plant, contact your vet or animal poison control.
See all plants toxic to cats and plants toxic to dogs.
What Pests and Diseases Affect the Lord Howe Island Iris?
Lord Howe Island Iris is susceptible to aphids, spider mites. Inspect the foliage regularly, especially along leaf undersides and stems. Treat infestations promptly with insecticidal soap or neem oil to prevent spread.
Yellow leaves, brown tips or drooping? See common plant problems and how to fix them.
What USDA Hardiness Zone Does the Lord Howe Island Iris Need?
Lord Howe Island Iris grows outdoors in USDA Zone 12a. It survives winters down to planting zone 12a. In cooler regions, grow Lord Howe Island Iris as a houseplant or bring it indoors before the first frost.
Hardiness Zone
Zone 12a
Keep exploring plants
Lord Howe Island Iris is one of many species covered in the complete plant care and identification guide, which groups plants by genus, attribute, and popularity.
It belongs to the Dietes genus — compare its care with other Dietes species on PlantoScan.
Dietes is part of the Iridaceae plant family — browse all Iridaceae genera and species.
Lord Howe Island Iris thrives in bright light and direct sun — see other bright-light plants.
Related Plant Care Guides
Closely related plants with similar care requirements:
Sources
- Scientific name & taxonomy: Dietes robinsoniana Klatt, family Iridaceae (first published in Abh. Naturf. Ges. Halle 15: 374 (1882)) — World Flora Online record, IPNI name record.
- Pet toxicity: Lord Howe Island Iris is reported as toxic to pets in our plant data (not verified by the ASPCA), so treat it with caution. Checked against the ASPCA plant list; any other toxicity note on this page comes from PlantoScan's plant database.
- Hardiness zone: USDA Zone 12a, calculated from the plant's minimum temperature.
- Care values(watering, light, temperature, humidity, soil, fertilizing): PlantoScan's plant database, filtered by automatic plausibility checks — values that fail them are hidden. How we source and check plant data.
Spotted a mistake? Email info@upvision.media with the page link — we check and correct reported errors.
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