The Story
Plant Bio
Cyathea cooperi, commonly known as the scaly tree fern, is a fast-growing arborescent fern native to the wet sclerophyll forests and rainforest margins of eastern Australia. It develops a slender, single trunk topped by a broad canopy of arching, finely divided fronds that can reach up to five metres in length.
This species is distinguished by the prominent oval scars left on the trunk by fallen fronds and the thick dressing of pale, papery scales at the base of the leaf stalks. Unlike the slower-growing Dicksonia antarctica, it tolerates warmer conditions and higher humidity but remains highly sensitive to dry winds and direct midday sun.
Uses & Benefits:
Essentials
At a Glance
Plant Type
Fern
Height
236 inches
Width
177 inches
Light
Partial Sun, Shade
Zones
9, 10
Water
High
Humidity
High
Lifespan
Long-lived
Native To
Eastern Australia
Toxicity
Non-toxic
Planting
How to Grow
- Select a position in part to full shade that is protected from strong, drying winds.
- Incorporate generous amounts of well-rotted organic matter into a moist, well-drained soil.
- Plant the root ball at the same depth as it was in the container, securing the trunk if necessary until established.
- Water regularly and apply a thick layer of organic mulch around the base to retain soil moisture.
Pro Tip
Water the entire length of the fibrous trunk rather than just the soil at the base, as tree ferns absorb a significant portion of their moisture and ambient humidity through the trunk surface.
Keep It Thriving
Care Guide
Do
- Water the trunk daily during hot, dry summer periods to maintain high ambient humidity.
- Apply a light application of organic fertiliser or well-rotted compost to the root zone in spring.
- Remove dead, completely brown fronds by cutting them close to the trunk.
Don't
- Never prune green or semi-green fronds, as this starves the plant of energy and stunts trunk growth.
- Do not allow the soil to dry out completely, which causes rapid frond desiccation.
- Never water or fertilise directly into the growing crown, which can encourage rot.
Seasonal Care Calendar
| Task | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Fertilize | ||||||||||||
| Mulch | ||||||||||||
| Pest Check | ||||||||||||
| Prune | ||||||||||||
| Winter Prep |
Watch Out For
Pests & Diseases
Common Pests
Common Diseases
In the Garden
Landscape Uses & Companions
Landscape Uses
Multiply
Propagation Methods
Good to Know
Common Questions
Scaly Tree Fern questions
What zones can Scaly Tree Fern grow in?
Scaly Tree 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.
When does Scaly Tree Fern bloom?
Scaly Tree Fern typically blooms in year round through year round. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.
Does Scaly Tree Fern need full sun?
Scaly Tree Fern does best in part shade.
Keep exploring
Explore the genus
Hardy in your zone?
Grow Scaly Tree 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.