Cullen australasicum can grow to a height of 2.5 metres and a width up to 1.5 m.[1] Stems can become woody at the base.

[1] It predominantly occurs in the arid zone of Australia in low rainfall environments, and can be found in all mainland states and territories.

[1][3] Favoured habitats include rocky gorges, woodland, grassland, dry creek lines and depressions.

[3] Cullen australasicum is a larval food plant of the Chequered swallowtail butterfly, Long-tailed Pea-blue, Common Grass-blue, Cotton Bollworm and Native Budworm.

[4] Light pruning is recommended to maintain a compact form and to prevent the more common straggly appearance of naturally occurring plants.