Oblique Cyrtanthus Plant Care
Cyrtanthus obliquus (L.f.) L.f.
Updated · Sources · How we source care data
Cyrtanthus obliquus, the Knysna lily, is a species of flowering plant in the amaryllis family. It has spiralling leaves and large pendulous flowers.
Every 7–10 days
Bright indirect light
60–75°F
40–60%
At a glance
How do you care for Oblique Cyrtanthus?
Water Oblique Cyrtanthus every 7–10 days, letting the top layer of soil dry out between waterings, and give it bright indirect light. It prefers temperatures of 60–75°F (16–24°C) and 40–60% 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.
Where Is the Oblique Cyrtanthus Native To?
What Is the Oblique Cyrtanthus?
Oblique Cyrtanthus (Cyrtanthus obliquus) belongs to the Amaryllidaceae family within the Cyrtanthus genus. Oblique Cyrtanthus is native to coastal grasslands from KwaZulu-Natal to the Eastern Cape, South Africa. Oblique Cyrtanthus is also known as Fire Lily, Olipha Lily.
Oblique Cyrtanthus displays a clumping perennial growth habit, reaching up to 1.5 ft tall with a spread of approximately 1 ft. Oblique Cyrtanthus produces tubular flowers in shades of red, orange, or yellow.
Leaf size: approximately 12 inches.
How Often Should You Water a Oblique Cyrtanthus?
Cyrtanthus obliquus 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 Oblique Cyrtanthus Need?
Oblique Cyrtanthus thrives in bright indirect light. Avoid placing Oblique Cyrtanthus in direct, harsh sunlight for extended periods, as this can scorch the foliage.
Light Requirement
Bright indirect light
What Temperature and Humidity Does the Oblique Cyrtanthus Prefer?
Cyrtanthus obliquus grows best at temperatures of 60–75°F. Oblique Cyrtanthus prefers humidity levels of 40–60%.
Temperature
60–75°F
Humidity
40–60%
What Soil Mix Works Best for a Oblique Cyrtanthus?
Well-draining sandy soil mix with added organic matter. Good drainage is essential for Oblique Cyrtanthus to prevent waterlogging, which leads to root rot and fungal issues.
How Often Should You Fertilize a Oblique Cyrtanthus?
Feed Oblique Cyrtanthus 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 Oblique Cyrtanthus?
Repot every 1-2 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 Oblique Cyrtanthus?
Oblique Cyrtanthus can be propagated through offsets, division, seeds. Similar propagation techniques also apply to fergusons fire lily plant care, which shares the same genus.
Is the Oblique Cyrtanthus Toxic to Pets and Children?
Toxic (caution)
Reported as toxic in our plant data. Not verified by the ASPCA.
Toxic to cats and dogs, mildly toxic to humans
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 Oblique Cyrtanthus?
Oblique Cyrtanthus is susceptible to aphids, spider mites, thrips. 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 Oblique Cyrtanthus Need?
Oblique Cyrtanthus grows outdoors in USDA Zone 13a. It survives winters down to planting zone 13a. Oblique Cyrtanthus is native to coastal grasslands from KwaZulu-Natal to the Eastern Cape, South Africa. In cooler regions, grow Oblique Cyrtanthus as a houseplant or bring it indoors before the first frost.
Hardiness Zone
Zone 13a
Keep exploring plants
Oblique Cyrtanthus 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 Cyrtanthus genus — compare its care with other Cyrtanthus species on PlantoScan.
Cyrtanthus is part of the Amaryllidaceae plant family — browse all Amaryllidaceae genera and species.
Oblique Cyrtanthus 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: Cyrtanthus obliquus (L.f.) L.f., family Amaryllidaceae (first published in Hort. Kew. 1: 414 (1789)) — World Flora Online record, IPNI name record.
- Pet toxicity: Oblique Cyrtanthus 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 13a, 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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