Drosera graniticola is a tuberous sundew that is especially known for its prolific flowering. It is named for its association with the granite outcrops of the Wheatbelt in Western Australia.

Drosera graniticola has an erect stem that grows to around 20 cm in height. The stem can sometimes branch towards the end. The foliage is bronze to rust in colour with a distinctive greyish tone. The leaves are crescentic, with a broad notch at the top. The plant produces many flowers on a branching flower stem. These white blooms are relatively long lived, with each plant capable of producing over 15 concurrently open flowers. A distinctive feature is the immature anthers, which are bright pink before splitting open to present the yellow pollen.

As its name suggests, the species is associated with granite outcrops in the Wheatbelt of Western Australia around the town of Hyden. It typically grows in the damp gravelly washes that accumulate at the base of the large rocks. The species is dormant over summer.

Drosera graniticola is distinguishable from other erect species by its colour, which has a distinctively greyish tone. In the wild, it is distinguished from its sympatric species by its crescent lamina (as opposed to the orbicular laminae of Drosera macrantha and D. stricticaulis) and lack of a basal rosette in mature specimens (A strong basal rosette is present in D. andersoniana and D. yilgarnensis).