Spotted Gums make great urban trees

The Spotted Gum, Corymbia maculata, is one eucalypt that is easy to identify. And yes, it is a eucalypt despite the ‘corymbia’ part of its scientific name – corymbia and angophora are now considered as sub-genera of the eucalypt group. Korymbus is Greek for bunches of flowers or fruit and maculatus is Latin for spotted.

Spotted Gums in Princes Way Drouin

The Spotted Gum is endemic to south-east Australia, from south-east Qld to southern NSW. There is a disjunct population near Orbost in Victoria.

Spotted Gums are frequently used for urban plantings. They are attractive, grow straight, easy to establish and they tolerate poor urban conditions and have few lower branches to obstruct views.

When Spotted Gums replace their bark each season, they do it in patches, giving rise to the recognisable spots that can vary from green to tan to grey over time. Spotted Gums often flower profusely, attracting nectar-seeking birds, insects and mammals. Their broad, dense canopies provide shade and shelter and add beauty.

Musk and Rainbow Lorikeets love Drouin's Spotted Gums

Once credited with being ‘limb-droppers’, Spotted Gum varieties are now bred to minimize this characteristic.

C.maculata can grow large. Old Blotchy, ‘the world’s largest Spotted Gum’ at Termeil in NSW is 59m tall, has a trunk girth of 10·7m and is estimated to be over 400 years old.

As urban planners look toward planting more resilient trees to help mitigate the effects of a warming world, they could do a lot worse than choose the beautiful and rewarding Spotted Gum.

Some introduced avian ‘pests’

The Friends of Drouin’s Trees is in the middle of its autumn bird surveys for 2024. This might be the time to investigate the history and habits of some of our introduced bird species we call ‘ferals’.

In the mid nineteenth century in Australia and New Zealand acclimatisation societies were established to introduce exotic animals and plants. The much-vaunted Ferdinand von Meuller, Victoria’s first government botanist, was alone responsible for ‘distributing’ thousands of introduced plants and seeds! In its short life of just 11 years from 1861 to 1872, the Victorian Acclimatisation Society played a devastating role in this state’s ecology.

SPARROW

The very cosmopolitan House Sparrow was introduced to Victoria in the late 1860s. This little bird thrives wherever there is human habitation – farms, granaries, school yards, town squares, etc. It is a very sociable and gregarious species. The House Sparrow competes with native birds for food and nesting sites. Many references suggest the sparrow is host to a large number of parasites and diseases.

STARLING

The scientific name Sturnus vulgaris is very appropriate for this boisterous and aggressive introduced bird. Starlings are native to northern Europe where they are a migratory species. Here, they seem to have lost the need to migrate and might perform some seasonal local movements only. Their preference for cavities in buildings and trees for their nesting sites is perhaps their worst feature. Starlings quickly drive away native birds that are hollow-dependent for their breeding regimes. They were introduced in the vain hope of keeping pest insects under control. English starlings were introduced in the eastern states from 1863 onwards.

MYNA

Mynas and starlings are related – they belong to the Sturnidae family. The Common Myna was introduced to Melbourne in circa 1860 to help control caterpillars in market gardens. They were only partly successful and soon spread to other areas as well as being ‘shipped’ to north Queensland to control pests in sugar cane. Mynas seldom occupy places with dense vegetation, preferring open areas of parklands, streets, back yards, etc. In 2000, the Common Myna was listed among 100 of the world’s worst invasive species by the World Conservation Union. A nation-wide survey in Australia in 2005 placed the myna at number one pest – ahead of the Cane Toad, rabbit, feral cat, etc. Like starlings, mynas aggressively defend their territories and nesting sites, driving off native birds.

DOVE

The Spotted Dove was introduced in Melbourne in the 1860’s principally for aesthetic reasons. Their native range is the Indian sub-continent and south-east Asia. Some references suggest the Spotted Dove is not a pest to the degree of others in this list. It is believed to have displaced the native Peaceful Dove in some districts but now itself is considered to be ‘under pressure’ from the native Crested Pigeon which seems to be expanding its range. When they drink they only need to place their bill in water. They sort of inhale the water, using their bill like a straw. Other birds need to lift their heads after they take a drink so they can swallow water, but not doves and pigeons.

BLACKBIRD

Pioneers to Victoria found the birdsong of the native species unfamiliar and alien. Wealthy early settlers regarded blackbirds to be a worthy addition to their European-style gardens, principally for their song. The bird quickly spread throughout the state. Even today it is pretty much the most abundant bird in Melbourne and although mainly found in urban areas it is not unusual to see blackbirds in native bushland settings these days. The Common Blackbird is thought to be the principal vector for the spread of the invasive species Sweet Pittosporum.

GOLDFINCH

The European Goldfinch is a small bird in the finch family that is native to Europe, North Africa, and western and central Asia. In Victoria it was introduced in several locations in the late nineteenth century. Apparently, many of these introductions failed, but now the bird is well established, particularly in ‘wasteland’ areas on urban edges. Overseas, the bird is often called the Thistle Bird because of its preference for the seeds of the thistle plant. Goldfinches like to line their nests with mosses, lichens and plant down from thistles.

Leafy streets mean higher house prices

In 2022, Architecture and Design Australia reported that, “Australian homes are among the largest in the world” and that the trend is for them to become bigger! Our units are the largest in the world too.

Data from the Australian Bureau of Statistics shows that house block sizes have been diminishing since 2012. Seldom is there room for a canopy tree in the back or front yard. Yet garden or street trees can do more than just provide shade, lower energy costs and provide health benefits for the residents. Research shows that they can improve a home’s value by tens of thousands of dollars.

A study by the independent advisory body Infrastructure Victoria concluded that property prices for equivalent homes were inversely proportional to their distance from some parkland. Infrastructure Victoria found that this relationship was strongest in regional areas and could produce a difference in house price by as much as $86,000. Interestingly, they found that the effect of a property being near a shopping district has a positive effect on house prices in the country and a negative effect in the city.

The Age, as recently as a few weeks ago, reported that the Victorian Planning Authority has proposed changing the state’s housing code for new suburban estates to encourage developers to include a “deep soil zone” of at least 2.5 square metres for a canopy tree on new properties of less than 300 square metres. Just this last weekend, an article in The Age suggested that Victoria can no longer call itself the ‘Garden State’.

As long ago as 2017, AECOM, a multinational infrastructure consulting firm produced a report Green Infrastructure – a vital step to brilliant Australian cities, in which they state that in the Sydney suburb of Annandale, the average increase in the value of land resulting from a 10% increase in tree canopy was $332 …. per square metre!

A report in the digital property portal, Domain, concludes “… home buyers were prepared to pay a significant premium to live in a leafy street and that premium was up to 3 per cent.”

Lendi, a prominent Australian online home loan platform: “Not only has it been proven that natural surroundings can lead to positive health benefits, but it has also been linked to reduced crime rates, increased property prices, and a welcome drop in temperatures for warmer suburbs.”

Putting your house on the market? Plant a tree!