It is an erect, bushy, sometimes low-lying shrub with egg-shaped to elliptic leaves and tube-shaped white flowers in small clusters on the ends of branches.

Epacris petrophila is an erect, bushy, sometimes low-lying shrub that typically grows to a height of 30–80 cm (12–31 in) and has softly-hairy branchlets.

The flowers are borne in clusters up to 10 mm (0.39 in) long on the ends of branches and are more or less sessile with 8 to 10 bracts at the base.

[2][3][4] The seeds of E. petrophila weigh about 0.02 g (0.00071 oz) and are only 0.5 mm (0.020 in) long, suggesting dispersal by wind or water, or in mud adhering to the feet of birds.

[8] The seed of Epacris petrophila was featured on the $1 postage stamp issued on 8 October 2019 by Australia Post.