Eucalyptus tumida, commonly known as the Esperance Plains Mallee, is a species of mallee eucalyptus native to a restricted area of Western Australia. This distinctive plant is characterized by its multi-stemmed growth habit, a common feature of mallee forms, which typically arise from a lignotuber. The Esperance Plains Mallee is a medium-sized mallee, generally reaching heights of 3 to 8 meters. Its leaves are lanceolate to ovate, exhibiting a glossy, dark green upper surface and a paler, duller underside. The juvenile leaves are often broader and more rounded than the adult foliage. The flowering period of Eucalyptus tumida occurs from late winter to spring, producing creamy white flowers that are attractive to pollinators. These flowers are followed by woody capsules, or gumnuts, which are typically cup-shaped and relatively small. The bark of the Esperance Plains Mallee is smooth and shedding, often described as being powdery or chalky, and typically white to pale grey, peeling off in long ribbons to reveal a smooth, cream or pale pink underbark. This shedding bark is a characteristic feature that aids in its identification. The natural habitat of Eucalyptus tumida is confined to the Esperance Plains region of Western Australia, where it grows in sandy soils, often on low-lying plains or in swales. It is typically found in mallee scrubland or woodlands, often in association with other mallee species. While its native range is limited, the Esperance Plains Mallee can be cultivated in similar well-drained sandy soil conditions. It is moderately frost-tolerant once established and prefers a sunny aspect. Eucalyptus tumida plays a role in its local ecosystem, providing habitat and food sources for native fauna. Like many eucalypts, its foliage contains essential oils, though specific documented uses for this species are not widely established. The smooth, shedding bark and attractive foliage make it a visually interesting specimen for horticultural purposes in suitable climates, particularly for those seeking to replicate the flora of the Esperance region. Its restricted distribution highlights the importance of conservation efforts for this unique Western Australian endemic.