It has smooth bark, sometimes with rough, ribbony bark near the base, lance-shaped adult leaves, flower buds in groups of seven, creamy white, pale yellow, sometimes pink or red flowers, and cylindrical, barrel-shaped or bell-shaped fruit.

[2][3][4][5][6][7] Eucalyptus incrassata was first formally described by the botanist Jacques Labillardière in 1806 in his two-volume treatise, Novae Hollandiae Plantarum Specimen.

[10] Lerp mallee is often found along sandplains and hillsides and is distributed from the Mid West, through the Wheatbelt and along the south coast in the Great Southern and Goldfields-Esperance regions of Western Australia where it grows in sandy soils.

[11] It is associated with the western mallee subgroup which is characterised by several eucalypts including E. oleosa, E. moderata, E. eremophila, E. foecunda, E. redunca and E. uncinata.

The tree is susceptible to powdery mildew in the wetter months of winter, it can also be affected by myrtle rust and by dieback.