Donnybrook’s historic River Red Gums
River Red Gum trees (Eucalyptus camaldulensis), some estimated to be over 300 years old, characterise the landscape along Donnybrook Road and within the boundaries of Peppercorn Hill.
Typically, the trees have a thick trunk, expansive asymmetrical canopies, and unique structural features that emerge over their long lifespan.
Writing in The Conversation, Dr Gregory Moore of the School of Agriculture, Food and Ecosystem Sciences at the University of Melbourne, said that the species is one of the most iconic of Australia’s eucalypts.
“Most specimens have smooth bark with a mottling of multiple colours ranging from creams to orange and red, but there may be a skirt of fibrous grey bark for the first few metres of the base.
“They are called River Red Gums because they grow along rivers and their wood, when freshly exposed, is a bright red; almost blood-coloured,” Dr Moore said.
“The wood is red because it contains very high levels of chemicals such as polyphenols, which are a natural antibiotic when combined with air.”
New Neighbourhoods, Living Heritage
The Tree Management Protection Report (TMPR) for Peppercorn Hill identified 36 River Red Gums to be retained and protected during construction.
Survival depends on deliberate, site-specific management – protective fencing, ground protection, controlled access, mulching regimes and ongoing supervision by professional arborists.
They can also shed large limbs unpredictably, even in calm conditions, which underscores the need for active risk management.
Why mature River Red Gums are important
Ecologically, River Red Gums operate on a different scale from younger plantings. Parks Victoria describes them as landscape giants that form the base of entire food webs. When large limbs fall, they begin the slow process of hollow formation—habitat that can take many decades to develop and is irreplaceable in the short to medium term.
These hollows support parrots, cockatoos, owls, gliders, possums, microbats, reptiles, and invertebrates. Coarse woody debris on the ground adds another layer of habitat complexity. Once lost, this ecological function cannot be easily replicated.
It’s one reason mature River Red Gums in Whittlesea and Peppercorn Hill are afforded special protection, and why retention of existing trees matters far more than replacement planting alone.
River Red Gums, as per their name, are intrinsically linked to water. They are the most widely distributed eucalypt on mainland Australia, thriving along rivers, creeks and floodplains where deep, moist, clay-rich subsoils prevail. They are adapted to extremes of flood and drought.
Place, identity and restraint
The City of Whittlesea’s River Red Gum Protection Policy places significant heritage and environmental value. The policy prioritises retention, public siting, generous tree protection zones and early integration into the design of new subdivisions.
The oldest River Red Gums in Whittlesea are estimated to be up to 500 years old.
The National Trust of Australia (Victoria) has commended the policy, emphasising the importance of careful site assessment at the very start of urban development when significant trees can still influence planning outcomes.
At Peppercorn Hill, the River Red Gums shape the growing neighbourhoods, like Woodlands.
From the planner’s perspective, these trees establish character and identity. Peppercorn Hill’s masterplan and precincts adapt to the centuries-old River Red Gums, forming the inspiration for future parks, trails and public spaces.
As the population of Donnybrook grows, these trees stand as living heritage, soon to become local landmarks and meeting spot for new neighbours.
We’re creating precincts of Peppercorn Hill with the patience required to build beside significant ecological assets that have already stood for three centuries.
Learn more about life at Peppercorn Hill