Cyathea rosenstockii Plant Care
Sphaeropteris rosenstockii (Brause) R.M.Tryon
Updated · Sources · How we source care data
This plant boasts stunning, large fronds that resemble a ruffled fan, giving it a unique and eye-catching appearance. Originating from Papua New Guinea, Sphaeropteris rosenstockii is highly sought after by plant collectors for its rare and exotic beauty, making it a prized addition to any collection.
Every 7–14 days
Filtered sunlight or partial shade
60–75°F
60–80%
At a glance
How do you care for Cyathea rosenstockii?
Water Cyathea rosenstockii every 7–14 days, letting the top layer of soil dry out between waterings, and give it filtered sunlight or partial shade. It prefers temperatures of 60–75°F (16–24°C) and 60–80% humidity. Fertilize it every 6 months during the growing season.
Where Is the Cyathea rosenstockii Native To?
What Is the Cyathea rosenstockii?
Cyathea rosenstockii (Sphaeropteris rosenstockii) belongs to the Cyatheaceae family within the Sphaeropteris genus. Cyathea rosenstockii is native to New Guinea. Cyathea rosenstockii is also known as Alsophila rosenstockii.
Cyathea rosenstockii displays a large, spreading fern growth habit, reaching up to 5 ft tall with a spread of approximately 4 ft. Cyathea rosenstockii produces non-flowering.
Leaf size: approximately 24 inches.
How Often Should You Water a Cyathea rosenstockii?
Sphaeropteris rosenstockii requires watering every 7–14 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 7–14 days
Let soil partially dry between waterings
What Light Does the Cyathea rosenstockii Need?
Cyathea rosenstockii thrives in filtered sunlight or partial shade. Avoid placing Cyathea rosenstockii in direct, harsh sunlight for extended periods, as this can scorch the foliage.
Light Requirement
Filtered sunlight or partial shade
What Temperature and Humidity Does the Cyathea rosenstockii Prefer?
Sphaeropteris rosenstockii grows best at temperatures of 60–75°F. Cyathea rosenstockii prefers humidity levels of 60–80%. A pebble tray or humidifier helps maintain adequate moisture around the plant.
Temperature
60–75°F
Humidity
60–80%
What Soil Mix Works Best for a Cyathea rosenstockii?
Well-draining, rich, acidic soil with high organic content. Good drainage is essential for Cyathea rosenstockii to prevent waterlogging, which leads to root rot and fungal issues.
How Often Should You Fertilize a Cyathea rosenstockii?
Feed Cyathea rosenstockii 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 Cyathea rosenstockii?
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 Cyathea rosenstockii?
Cyathea rosenstockii can be propagated through spores, division of rhizomes.
Is the Cyathea rosenstockii Toxic to Pets and Children?
Pet safety not verified
The ASPCA does not list Cyathea rosenstockii, so we can't confirm whether it is safe for cats and dogs. Keep pets from chewing it as a precaution.
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 Cyathea rosenstockii?
Cyathea rosenstockii is susceptible to spider mites, scale insects. 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 Cyathea rosenstockii Need?
Cyathea rosenstockii grows outdoors in USDA Zone 13a. It survives winters down to planting zone 13a. Cyathea rosenstockii is native to New Guinea. In cooler regions, grow Cyathea rosenstockii as a houseplant or bring it indoors before the first frost.
Hardiness Zone
Zone 13a
Keep exploring plants
Cyathea rosenstockii 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 Sphaeropteris genus — compare its care with other Sphaeropteris species on PlantoScan.
Sphaeropteris is part of the Cyatheaceae plant family — browse all Cyatheaceae genera and species.
Cyathea rosenstockii 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: Sphaeropteris rosenstockii (Brause) R.M.Tryon, family Cyatheaceae (first published in Contr. Gray Herb. 200: 23 (1970)) — World Flora Online record, IPNI name record.
- Pet toxicity: Pet safety not verified: the ASPCA does not list Cyathea rosenstockii, so we can't confirm whether it is safe for cats and dogs. 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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