Acacia pruinosa, the Frosty Wattle, is a medium to tall shrub. The leaves are bipinnate with 9-20 pairs of pinnules (leaflets) per compound leaf. The pinnules are grey-blue. Globular flower heads carry from 40-60 deep yellow flowers. The heads are in long axillary racemes or panicles. Flowering occurs between August and November. The pods, that follow the flowers, are up to 14 centimetres long, leathery and constricted between seeds. They ripen between November and January. This is the normal seed ripening period for all spring flowering wattles.
The Frosty Wattle is found in northern NSW and southern Queensland.
Acacia pruinosa is one of the few wattles that does not take kindly to pruning. Plants may become straggly and is best grown as a component of native shrubberies.
Propagate from seed that should be soaked in boiling water before sowing.
The species was previously known as A. spectabilis var stuartii.
The type was collected by Alan Cunningham on the Liverpool Plains, NSW in 1827.
Both species and common names refer to the powdery secretion on the foliage.