The Story
Plant Bio
Flindersia australis, commonly known as Crow's Ash, is a large, semi-deciduous Australian tree that develops a dense, rounded canopy and a moderately buttressed trunk with age. The species is native to dry and subtropical rainforests of eastern Australia, where it grows in fertile, well-drained soils under full sun to partial shade.
The foliage features glossy green, pinnate leaves with prominent oil glands that release a light citrus scent when crushed, complemented by bronze-coloured new growth. In spring and summer, the branches bear terminal clusters of small, white-to-cream flowers with hairy petals, followed by large, woody, star-shaped seed capsules covered in blunt prickles.
Uses & Benefits:
Essentials
At a Glance
Plant Type
Tree
Height
1181 inches
Width
590 inches
Light
Full Sun, Partial Sun
Zones
9, 10
Water
Low
Humidity
High
Lifespan
Long
Native To
Eastern Australia
Toxicity
Non-toxic
Bloom period
Spring – Summer
In flower about 4 months of the year
Planting
How to Grow
- Select a planting site with deep, fertile soil and full sun to partial shade, ensuring ample clearance from buildings and underground infrastructure.
- Dig a hole twice the width of the root ball and to the same depth, then backfill with native soil, firming gently to remove air pockets.
- Water deeply immediately after planting and maintain consistent moisture during the first two growing seasons to establish a deep root system.
- Apply a thin layer of organic mulch around the base, keeping it clear of the trunk to prevent collar rot.
Pro Tip
Avoid pruning into old, leafless bare wood as epicormic shooting is highly unpredictable; instead, limit pruning to the removal of crossing or damaged branches to maintain the natural oval crown.
Keep It Thriving
Care Guide
Do
- Water deeply during extended dry periods, especially while the tree is young.
- Protect young saplings from heavy winter frosts using tree guards or temporary covers.
- Allow the tree to drop leaves naturally during dry spells, as this is a normal survival mechanism.
Don't
- Do not plant this tree close to pathways or driveways where the heavy, prickly fallen seed capsules could present a slip or puncture hazard.
- Do not apply heavy doses of high-phosphorus fertilisers; a light application of slow-release native fertiliser is sufficient.
- Do not prune heavily into old, bare wood.
Seasonal Care Calendar
| Task | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Fertilize | ||||||||||||
| Mulch | ||||||||||||
| Pest Check | ||||||||||||
| Prune |
Watch Out For
Pests & Diseases
Common Pests
In the Garden
Landscape Uses & Companions
Landscape Uses
Companion Plants
Multiply
Propagation Methods
Good to Know
Common Questions
Crow's Ash questions
What zones can Crow's Ash grow in?
Crow's Ash 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 Crow's Ash bloom?
Crow's Ash typically blooms in spring through summer. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.
Does Crow's Ash need full sun?
Crow's Ash does best in full sun to part shade. In hot climates, afternoon shade keeps blooms fresher longer.
Is Crow's Ash drought tolerant?
Yes — once established (usually after the first full season), Crow's Ash 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 Crow's Ash 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.