The Story
Plant Bio
Alsophila dealbata is a slow-growing evergreen tree fern that develops a single, slender trunk topped by a dense, symmetrical crown of spreading fronds. The bipinnate to tripinnate fronds are glossy green on their upper surfaces and display a striking, powdery silvery-white coloration underneath.
The emerging fiddleheads, or koru, are covered in dark brown, glossy, twisted scales that protect the young growth. This species is highly valued for its architectural form and the dramatic contrast of its silver-backed foliage in shaded garden settings.
Uses & Benefits:
Essentials
At a Glance
Plant Type
Fern
Height
236"
Width
157"
Light
Partial Sun, Shade
Zones
9, 10
Water
High
Humidity
High
Lifespan
Long-lived
Native To
New Zealand
Toxicity
Non-toxic
Planting
How to Grow
- Select a sheltered site in partial to full shade, protected from hot afternoon sun and drying winds.
- Prepare a humus-rich, well-draining soil mix using organic matter to ensure consistent moisture retention without waterlogging.
- Plant the root ball at soil level, taking care not to bury the trunk or damage the delicate fibrous roots.
- Water the root zone and the trunk thoroughly after planting, and maintain a regular watering schedule to keep the soil damp.
Pro Tip
Never cut into the bare trunk wood or prune healthy green fronds prematurely; tree ferns grow from a single apical crown and will not branch or recover from severe crown damage.
Keep It Thriving
Care Guide
Do
- Water the trunk and root zone frequently during hot, dry spells to maintain high humidity and moisture.
- Apply a light layer of organic, well-rotted compost around the base in spring to provide gentle nutrients.
- Cut naturally spent, completely brown fronds close to the stem base to keep the plant tidy.
Don't
- Do not allow the trunk or root ball to dry out completely, as this fern is highly sensitive to drought.
- Do not use heavy chemical fertilizers, which can damage the sensitive root system.
- Do not water overhead during cold winter weather to prevent water from pooling and rotting the growing crown.
Seasonal Care Calendar
| Task | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Fertilize | ||||||||||||
| Pest Check | ||||||||||||
| Prune | ||||||||||||
| Winter Prep |
Watch Out For
Pests & Diseases
Common Pests
Common Diseases
In the Garden
Landscape Uses & Companions
Landscape Uses
Companion Plants
Multiply
Propagation Methods
Good to Know
Common Questions
Silver Fern questions
What zones can Silver Fern grow in?
Silver Fern is hardy in USDA Zones 9–10. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.
Does Silver Fern need full sun?
Silver Fern does best in part shade.
Keep exploring
Explore the genus
Hardy in your zone?
Grow Silver Fern with confidence
See it in a design of your actual yard, get zone-matched care reminders, and track it season by season in your garden journal.