Black Gum

Eucalyptus aggregata is a medium-sized tree, typically reaching 15–20 metres in height, characterised by rough, fibrous bark persisting on the trunk and larger branches, with smoother bark shedding on upper stems. Its narrow, lance-shaped adult leaves and small white flower clusters support a range of nectar-feeding birds and insects, while its canopy and fallen timber contribute structural habitat for woodland fauna. As a component of temperate eucalypt woodland, the species contributes to soil stabilisation and the broader function of its ecosystem as a carbon store and water regulator.

The species is restricted to southeastern Australia, occurring in scattered populations across the tablelands of New South Wales and adjacent areas, typically along frost hollows, riparian corridors, and poorly drained flats within temperate woodland and grassy woodland communities.

Its decline stems from clearing of land for agriculture and grazing, expansion of urban and peri-urban infrastructure that fragments remaining stands, and cumulative habitat fragmentation that isolates populations and limits gene flow. Altered fire regimes, including both increased fire frequency and fire exclusion, disrupt natural regeneration cycles, while shifting precipitation patterns associated with climate change add further stress to already reduced populations.

Conservation responses include legal protection under Australian state and federal threatened species legislation, inclusion in recovery planning documents, seed banking and ex-situ propagation efforts, and habitat protection within some reserves and travelling stock reserves. Community and landholder engagement programs support revegetation and fencing of remnant stands.

Population trends remain in decline, and without sustained habitat protection and restoration, the species' long-term persistence in the wild remains uncertain.

Eucalyptus aggregata occurs in open woodlands and grassy forests on well-drained soils, typically at elevations between 600-1200 meters in the tablelands and slopes of southeastern Australia. The species favors areas with moderate to high rainfall and is often found on granite-derived soils in association with other eucalyptus species.