The Story
Plant Bio
Stenocarpus sinuatus, the firewheel tree, is an evergreen Australian rainforest tree growing to fifteen metres in cultivation, with a narrow, column-forming habit and glossy, deeply lobed leaves. The distinctive wheel-like inflorescences consist of bright red tubular flowers radiating in a single plane, appearing along the branches and at the branch tips from summer to autumn.
The foliage is highly variable, displaying both entire oblong leaves and deeply pinnatifid leaves with sinuate margins on the same plant. Young stems and buds are covered in a minute, rusty-coloured pubescence that disappears as the growth matures.
Uses & Benefits:
Essentials
At a Glance
Plant Type
Tree
Height
590 inches
Width
157 inches
Light
Full Sun, Partial Sun
Zones
9, 10
Water
Moderate
Humidity
High
Lifespan
Long-lived
Native To
Australia, Papua New Guinea
Toxicity
Non-toxic
Bloom period
Summer – Autumn
In flower about 4 months of the year
Planting
How to Grow
- Select a planting site in full sun to light shade with deep, rich, well-drained soil.
- Dig a hole twice the width of the root ball and backfill with native-friendly organic compost.
- Water deeply and regularly during the first two to three years to establish the root system.
- Apply a thick layer of organic mulch around the root zone, keeping it clear of the trunk.
Pro Tip
Avoid standard garden fertilisers; high phosphorus levels toxify the proteoid root system, causing chlorosis and eventual death.
Keep It Thriving
Care Guide
Do
- Use low-phosphorus or native-formulated slow-release fertilisers.
- Protect young plants from heavy frosts during their first few winters.
- Ensure excellent soil drainage to prevent phytophthora root rot.
Don't
- Do not apply standard commercial fertilisers containing high phosphorus.
- Do not prune heavily into old, bare wood.
- Do not allow water to pool or waterlog the soil around the root system.
Seasonal Care Calendar
| Task | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Fertilize | ||||||||||||
| Mulch | ||||||||||||
| Pest Check | ||||||||||||
| Propagate | ||||||||||||
| Prune |
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
Firewheel Tree questions
What zones can Firewheel Tree grow in?
Firewheel Tree 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 Firewheel Tree bloom?
Firewheel Tree typically blooms in summer through autumn. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.
Does Firewheel Tree need full sun?
Firewheel Tree does best in full sun to part shade. In hot climates, afternoon shade keeps blooms fresher longer.
Is Firewheel Tree drought tolerant?
Yes — once established (usually after the first full season), Firewheel Tree handles dry spells with minimal watering. Water deeply its first year to build the root system that makes that possible.
Keep exploring
Explore the genus
Hardy in your zone?
Grow Firewheel Tree 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.