Alsophila dealbata
Alsophila dealbata · Cyatheaceae
The gardener's calendar
Ideal time to plant alsophila dealbata: set it out when the soil is neither frozen nor waterlogged, and water generously as it establishes.
ID card
- Common name
- Silver tree fern
- Family
- Cyatheaceae
- Type
- Tree fern
- Foliage
- Evergreen
- Adult size
- 5 to 10 m in height
- Hardiness
- Tender (0 to 5 °C)
- Origin
- New Zealand
- Light
- Partial shade to shade
Care
Watering
Keep the substrate regularly moist but not waterlogged. This fern appreciates a humid atmosphere: mist the foliage several times a week, particularly indoors or in dry conditions. Reduce watering slightly in winter without allowing the soil to dry out completely.
Light exposure
Place the fern in partial shade or shade. Avoid direct sunlight which burns the delicate foliage. Indoors, a bright location without direct sun rays is ideal, for example near a north or east-facing window.
Substrate and soil
Use light, well-draining potting soil enriched with organic matter (peat, pine bark or coco fiber). The pH should be slightly acidic. Good drainage is essential to prevent root rot.
Fertilizing
Apply a balanced, diluted fertilizer every 15 days during the growing period (spring-summer). Reduce or stop feeding in autumn-winter. Choose mild formulas specifically designed for ferns.
Cleaning and maintenance
Regularly remove dead or damaged fronds at the base to encourage vigor. Gently clean the foliage with a damp cloth to remove dust. Avoid leaf shine products which clog the stomata.
Pests and diseases
Watch for red spider mites and mealybugs, which are encouraged by dry air. Increase humidity to prevent them. In case of stagnant moisture, fungal rot may appear: improve ventilation and reduce watering.
Did you know?
Cyathea dealbata, the national emblem of New Zealand, is nicknamed 'Ponga' in Māori. Its delicate coiled fronds adorn the New Zealand flag and symbolize the country's cultural identity. These giant tree ferns are among the oldest forms of terrestrial life, existing for over 300 million years.
Where to buy it
Plant in spring or early autumn, avoiding spells of intense heat. Pick a plant with healthy foliage and roots that are not exposed. Best time: March, April, May, September.
Add this plant to my garden →Plants from the same family
- Sphaeropteris tomentosissimaSphaeropteris tomentosissima
- Soft tree fernAlsophila smithii
- Rough tree fernAlsophila australis
- Cyathea planadaeCyathea planadae
- GrapevineVitis vinifera
- SageSalvia officinalis
Tips generated and checked by Viridia — adapt them to your local climate.