Lexi Webster
Australia's native trees are predominantly evergreen, with eucalypts retaining their leaves year-round. However, some regions in Australia, particularly the southern and mountainous areas, are home to deciduous trees that exhibit vibrant autumn foliage. These include the southern beeches, comprising three species: Nothofagus cunninghamii, gunnii, and moorei, found in Tasmania and southern Victoria. The process of leaves changing colour involves the breakdown of chlorophyll, revealing underlying pigments and forming new ones, resulting in a display of yellow, orange, and red hues.
| Characteristics | Values |
|---|---|
| Trees that change colour in Australia | Deciduous trees |
| Why leaves change colour | Leaves contain a natural chemical called chlorophyll, which makes them green. Chlorophyll turns sunlight into food for the tree through photosynthesis. In summer, trees photosynthesise a lot. In autumn, with shorter and cooler days, deciduous trees break down the chlorophyll in the leaves and send the nutrients to the roots to be stored for spring and summer. |
| Colours of the leaves | Yellow, orange, red, and brown |
| Why the colours appear | The colours are already in the leaves but are masked by the green chlorophyll during the warmer months. |
| Why leaves fall | To save up nutrients for the spring and summer and to minimise damage from ice and snow |
| Where to see colourful leaves in Australia | Macedon Ranges, Dandenong Ranges, and the High Country in Victoria, Southern Highlands and the town of Orange in New South Wales, Mt Tamborine in Queensland, and across Tasmania. |
| Native Australian deciduous trees | Southern beeches (Nothofagus cunninghamii, gunnii, and moorei) |
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What You'll Learn
Why do leaves change colour?
In Australia, April is the month for autumn and fall colours. While the Northern Hemisphere welcomes spring, Australia experiences longer, cooler nights and shorter days. During this time, Australian deciduous trees display their colourful autumn foliage.
Leaves change colour due to the breakdown of chlorophyll, which gives leaves their green colour. Chlorophyll is a chemical in the leaves that captures sunlight and turns it into food for the tree through a process called photosynthesis. As the seasons change, temperatures drop, and days get shorter, resulting in less direct sunlight for the trees. This breakdown of chlorophyll reveals yellow and orange pigments, such as carotenes and xanthophyll pigments, that were previously masked during the warmer months.
Additionally, the decrease in chlorophyll can lead to the formation of new pigments called anthocyanins. These pigments are responsible for the darker red colours observed in some leaves. The trapped sugars in the leaves contribute to the production of new pigments, which were not present during the growing season.
The intensity of fall colours is influenced by various factors, including temperature, light, and water supply. Cool, dry, and sunny weather conditions tend to produce the most vibrant colours. The length of the night also plays a role, as the increasing night length in autumn triggers the slowdown and eventual stop of chlorophyll production.
In Australia, while most native trees are evergreen, there are some native deciduous trees called southern beeches, found in cool rainforests in Tasmania and southern Victoria. These trees provide colourful autumn foliage in certain parts of the country.
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Where to see colourful leaves in Australia
Australia is home to a variety of colourful foliage during autumn, particularly in the southern regions with higher rainfall. While Australia has very few native deciduous trees, many non-native species flourish in the southern hemisphere climate and soil.
Sydney, New South Wales, is a great place to start your journey to see the autumn colours. The Royal Botanic Garden Sydney is home to a variety of trees that display a spectacular array of colours, including the ancient Ginkgo tree with its golden autumn hues. The Blue Mountains, a 90-minute drive west of Sydney, is another popular spot, with its cool-climate gardens and streets of Leura lined with colourful maples, liquidambars, oaks and dawn redwoods. The Everglades House & Gardens is also a must-see, with its grand Art Deco house surrounded by towering trees and a carpet of autumn leaves.
The Southern Highlands in New South Wales is another popular autumn destination, known for its old-world charm, country mansions, formal garden estates, and wineries. Bowral is a highlight of the region, with the artistic grounds of Retford Park Bowral, the seasonal gardens of the Southern Highlands Botanic Gardens, and the Tulip Festival at Corbett Gardens, the town's oldest park.
For a wilder experience, head to Mount Field National Park in Tasmania, where you can see Australia's only native deciduous trees, the southern beeches, in all their autumn glory. The Adelaide Hills in South Australia, Macedon Ranges and Dandenong Ranges in Victoria, the town of Orange in New South Wales, Mt Tamborine in Queensland, and many other places in Tasmania are also popular leaf-looking destinations.
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Why some trees lose their leaves, but others don't
In Australia, most native trees are evergreen and retain their leaves throughout the year, only shedding old leaves gradually. Examples of Australian evergreens include eucalypts and pine trees. However, Australia's southern beeches, which grow in cool rainforests in Tasmania and southern Victoria, are native deciduous trees. These trees lose their leaves in the autumn, a phenomenon more commonly observed in colder regions like the Northern Hemisphere.
Trees that shed their leaves in autumn are called deciduous trees. They lose their leaves to conserve energy, prevent drying out, and allow wind to pass through their branches during winter. Deciduous trees have broad leaves that are green most of the year due to chlorophyll, which enables them to absorb sunlight for photosynthesis. As autumn approaches, the trees break down the chlorophyll and send the nutrients to the roots for storage. This process reveals the yellow and orange pigments, called carotenes, that were masked by the green chlorophyll during the warmer months. The darker red leaves result from trapped sugars producing new pigments called anthocyanins.
Evergreen trees, on the other hand, retain their leaves throughout the year, with some leaves gradually falling off from time to time. Their leaves remain green and functional for photosynthesis even in the winter. Pine trees, with their tough, needle-like leaves, are an example of evergreens adapted to withstand cold weather and snow.
The difference in leaf behaviour between deciduous and evergreen trees can be attributed to various factors, including climate, conservation of energy, and protection from drying out or wind damage. Deciduous trees are well-suited to cold regions, while evergreens are more common in places with milder winters or environments where their leaves are adapted to suit harsh conditions.
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The best conditions for colourful leaves
In Australia, most native trees are evergreen and retain their leaves all year round. However, some trees in Australia do change colour and lose their leaves in autumn. The best conditions for colourful leaves are dry, warm days followed by cool nights without frost and little wind.
Deciduous Trees
Deciduous trees lose their leaves in autumn, usually over a few weeks. They are more common in colder parts of the world, particularly in the Northern Hemisphere, where winters are freezing and snowy. In Australia, some deciduous trees have been introduced from other parts of the world and have adapted to the local climate and soil. These trees can provide colourful autumn foliage.
Evergreen Trees
Evergreen trees, such as pine trees, retain their leaves all year, even in cold and snowy conditions. In Australia, eucalypts are an example of evergreen trees that hold their leaves year-round.
Leaf Colour Change
Leaves change colour due to the breakdown of chlorophyll, which is necessary for photosynthesis. As temperatures drop and days get shorter, trees receive less direct sunlight, leading to the breakdown of chlorophyll. This reveals the yellow and orange pigments that were masked during warmer months. Darker red leaves result from a chemical change where trapped sugars produce new pigments called anthocyanins.
Best Conditions for Colourful Leaves
The best conditions for vibrant autumn colours are dry, warm days followed by cool nights. This combination allows the leaves to remain on the trees while revealing their colourful glory. Windy conditions or frost can cause the leaves to fall prematurely, reducing the duration of the colourful display.
Leaf-Peeping in Australia
Despite having fewer deciduous trees, Australia still attracts "leaf peepers", people who travel to witness and photograph the changing colours of autumn leaves. Popular destinations for leaf peeping in Australia include the Adelaide Hills in South Australia, Macedon Ranges and Dandenong Ranges in Victoria, the Blue Mountains in New South Wales, and across Tasmania. These locations offer a chance to experience the beauty of autumn leaves in a unique setting.
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Invasive species in Australia
Australia is home to a variety of invasive species, which have been introduced over time and pose a significant threat to the country's native flora and fauna. The current wave of invasive species introductions began with the arrival of European settlers in 1788, though dingoes, which are considered an invasive species, arrived on the continent much earlier, between 5,400 and 4,600 years ago.
One notable invasive species in Australia is the cane toad, which has been the subject of control programs aimed at preventing its spread towards Darwin and Western Australia. Other invasive animal species include red foxes, feral cats, dogs, and pigs, which are often baited or trapped. Insects are the second most costly class of invasive species in the country, with fire ants causing billions of dollars in damage annually.
In addition to animals, several plant species have also become invasive in Australia. Olives, for example, can spread quickly by seed and crowd out native plants. The Chinese Tallow Tree, originally introduced as an oil-bearing plant, is another invasive species that can spread rapidly and take over forested areas. Weeds such as lantana and blackberry are also considered invasive, forming dense thickets that take over native bushland and pastures.
The impact of these invasive species has been significant, with research showing that invasive and pest species are a problem for approximately 1,257 threatened species in Australia. Rabbits, a plant root disease, and feral pigs are the top three most destructive invasive species, impacting hundreds of native species.
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Frequently asked questions
Yes, some trees in Australia change colour in autumn.
Australia's only native deciduous trees are called southern beeches. There are three species, called Nothofagus cunninghamii, gunnii and moorei. They grow in cool rainforests in Tasmania and southern Victoria.
Trees change colour due to a breakdown of chlorophyll in their leaves. Chlorophyll is a natural chemical that makes leaves green and turns sunlight into food for the tree through a process called photosynthesis. As the season changes, temperatures drop and days get shorter, resulting in less direct sunlight. This causes the chlorophyll in the leaves to break down, revealing yellow and orange pigments that were masked during the warmer months.
Popular tourist spots to see trees that change colour in Australia include the Adelaide Hills in South Australia, Macedon Ranges, Dandenong Ranges and the High Country in Victoria, Southern Highlands and the town of Orange in New South Wales, Mt Tamborine in Queensland, and across much of Tasmania.
