The fruit is a cup-like capsule, the seeds small and angular, remaining inconspicuous on the ground upon release.

[3][4][5][6][7] Baeckea gunniana was first formally described in 1843 by the German botanist Johannes Conrad Schauer in Walpers' book Repertorium Botanices Systematicae.

[5][6] Baeckea gunniana is commonly found growing with species such as Callistemon pityoides, Epacris paludosa, and Empodisma minus, in heathlands or boggy sedgeland.

[5][6] This species forms an integral part of the broad-toothed mouse habitat in New South Wales, providing protection from predators and large grazers.

[5] This may be reverted by removing or nicking the testa using a needle or scalpel, improving the rate of germination.