Variable tree fern Plant Care
Cyathea affinis (Forst.) Sw.
Updated · Sources · How we source care data
With its glossy, dark green fronds and intricate network of veins, this plant originating from New Zealand is a striking addition to any collection. Its unique appearance and rarity make it highly sought after by plant collectors looking to add a touch of elegance to their indoor jungle.
Every 7–10 days
Filtered sunlight or partial shade
60–75°F
60–80%
At a glance
How do you care for Variable tree fern?
Water Variable tree fern every 7–10 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 Variable tree fern Native To?
What Is the Variable tree fern?
Variable tree fern (Cyathea affinis) belongs to the Cyatheaceae family within the Cyathea genus. Variable tree fern is native to Fiji, Samoa, the Cook Islands, Austral Islands, Tahiti, and the Marquesas Islands.
Variable tree fern displays a large, tree-like fern growth habit, reaching up to 10 ft tall with a spread of approximately 6 ft. Variable tree fern produces non-flowering.
Leaf size: approximately 36 inches.
How Often Should You Water a Variable tree fern?
Cyathea affinis 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 Variable tree fern Need?
Variable tree fern thrives in filtered sunlight or partial shade. Avoid placing Variable tree fern 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 Variable tree fern Prefer?
Cyathea affinis grows best at temperatures of 60–75°F. Variable tree fern 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 Variable tree fern?
Well-draining, rich organic soil with high moisture retention. Good drainage is essential for Variable tree fern to prevent waterlogging, which leads to root rot and fungal issues.
How Often Should You Fertilize a Variable tree fern?
Feed Variable tree fern 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 Variable tree fern?
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 Variable tree fern?
Variable tree fern can be propagated through spores, division of rhizomes. Similar propagation techniques also apply to silver tree fern plant care, which shares the same genus.
Is the Variable tree fern Toxic to Pets and Children?
Pet safety not verified
The ASPCA does not list Variable tree fern, 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 Variable tree fern?
Variable tree fern is susceptible to aphids, scale insects, mealybugs. 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 Variable tree fern Need?
Variable tree fern grows outdoors in USDA Zone 10b – 12b. It survives winters down to planting zone 10b. Variable tree fern is native to Fiji, Samoa, the Cook Islands, Austral Islands, Tahiti, and the Marquesas Islands. In cooler regions, grow Variable tree fern as a houseplant or bring it indoors before the first frost.
Hardiness Zone
Zone 10b – 12b
Keep exploring plants
Variable tree fern 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 Cyathea genus — compare its care with other Cyathea species on PlantoScan.
Cyathea is part of the Cyatheaceae plant family — browse all Cyatheaceae genera and species.
Variable tree fern produces blooms — browse other flowering plants.
More Cyathea Species
Other Cyathea species in PlantoScan's care catalogue share similar watering, light, and soil preferences:
Sources
- Scientific name & taxonomy: Cyathea affinis (Forst.) Sw., family Cyatheaceae (first published in J. Bot. (Schrader) 1800(2): 94 (1801)) — World Flora Online record, IPNI name record.
- Pet toxicity: Pet safety not verified: the ASPCA does not list Variable tree fern, 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 10b – 12b, estimated from the plant's typical growing conditions.
- 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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