It is found in alpine and subalpine heathlands of Victoria, Australia, between the elevations of 1200-1500 m.
Apart from cultivated plants, it is now considered to be extinct in Tasmania, which was the first state it was described in. It grows in sheltered and exposed sites, on acidic loams to gravely or stony soils.
P. cuneata is a dense, evergreen shrub to around 1 m tall . It has long or soft shaggy hairs on strong, woody branches that can carry the weight of snow that covers it in winter. A distinguishing feature is the shiny, wedge-shaped leaves, which are dotted with oil glands. When the leaves are crushed they emit a lovely minty, eucalyptol fragrance.
The flowers are a very attractive trumpet-shape, coloured white with many purple, red or yellow blotches in the throat. Many insects, especially bees are attracted to this flower, which contains a reserve of nectar. P. cuneata flowers from April to November. The shrub form is lovely in a pot on the windowsill or next to a pathway where the scent may be enjoyed.
P. cuneata prefers well-drained, moist conditions and It is frost and snow tolerant, P. cuneata is very easy to propagate. This species adds a lovely fragrance to any garden and is easily admired for its dark, evergreen foliage and pretty flowers.