Brachychiton populneus stores water in a thickened bottle-shaped trunk, which is why the Kurrajong stands green through droughts that strip everything around it. Graziers have relied on it as emergency stock fodder for generations, and it is one of the toughest shade trees in the country.
Brachychiton populneus grows to 10 to 20 metres tall and 5 to 10 metres wide at 30 to 60 centimetres per year, forming a dense conical to rounded canopy of glossy dark green foliage. Cream bell-shaped flowers appear through spring and summer, followed by woody boat-shaped seed pods.
This Australian native is frost hardy, surviving heavy and frequent frost without damage, and tolerates extreme heat, drought and poor shallow soils. It grows in full sun and is widely used for shade, avenue and streetscape planting in hot inland districts.
Frequently Asked Questions
About Brachychiton populneus
How big does the Kurrajong grow?
Brachychiton populneus reaches 10 to 20 metres tall and 5 to 10 metres wide, forming a dense conical to rounded canopy. It suits acreage, parkland, streets and larger gardens.
Why is the trunk swollen?
The Kurrajong stores water in its thickened trunk, an adaptation that lets it survive extended drought. Older trees develop a pronounced bottle shape, which is where the common name comes from.
How drought tolerant is the Kurrajong?
Exceptionally. It is among the most drought and heat tolerant trees available in Australia and stays green through conditions that defoliate most other species.
Is Brachychiton populneus an Australian native?
Yes. It is native to eastern Australia from Queensland through New South Wales into Victoria, and is a familiar sight across inland grazing country.
Is it frost hardy?
Yes. It survives heavy and frequent frost without damage, and equally tolerates extreme summer heat, which makes it unusually adaptable.
Does the Kurrajong drop much litter?
It sheds woody boat-shaped seed pods after flowering. The pods contain irritant hairs around the seeds, so they are best swept up rather than handled bare-handed.
How far apart should I plant Kurrajongs?
Plant 6 to 8 metres apart for an avenue, or 8 to 10 metres apart as individual shade trees so each canopy can develop fully.