It is a prostrate cushion shrub with lance-shaped leaves and groups of two to four reddish orange, tube-shaped flowers.

Andersonia grandiflora is a prostrate, densely-branched cushion shrub, that typically grows to 5–25 cm (2.0–9.8 in) high.

[2][3][4] Andersonia grandiflora was first formally described in 1859 by Sergei Sergeyevich Sheglejev in the Bulletin de la Société impériale des Naturalistes de Moscou from specimens collected by James Drummond.

[6] This species of Andersonia grows in boggy flats and rocky slopes in the Stirling Range National Park and surrounding areas in the Esperance Plains and Jarrah Forest bioregions of south-western Western Australia.

[3][2] Andersonia grandiflora is listed as "Priority Four" by the Government of Western Australia Department of Biodiversity, Conservation and Attractions, meaning that it is rare or near threatened.