Damon Mcknight
Australia's climate varies widely, from hot and humid to arid desert regions. This poses a challenge for gardeners, who must select plants suited to their specific hardiness zone. Plant hardiness maps indicate the average minimum temperature of an area, helping gardeners choose plants that will survive in their locality. Australia's hardiness zones range from 7 to 12, with some sources dividing the country into seven climatic zones: tropical, subtropical, temperate, arid, and cool/alpine. These zones are further influenced by local 'microclimates', which can vary according to elevation, latitude, and proximity to the coast. Understanding these growing zones is essential for successful gardening in Australia.
| Characteristics | Values |
|---|---|
| Number of Zones | 7 |
| Zone 1 | Alpine areas of south-eastern Australia |
| Zone 2 | Tablelands of south-east Queensland, New South Wales and Victoria, and the uplands of central Tasmania |
| Zone 3 | Southern half of the continent except for coastal areas |
| Zone 4 | Coastal Queensland, Sydney, north coast of NSW, Mornington Peninsula, Adelaide, and the southwestern coastal zone |
| Zone 5 | Queensland coast, Western Australia north of Shark Bay, and across the Top End |
| Zone 6 | Queensland coast north of Cairns, Cape York Peninsula, and the coast of the Northern Territory |
| Zone 7 | Islands off the north coast |
| Climatic Zones | Tropical, Subtropical, Temperate, Arid, and Cool/Alpine |
| Subtropical Zone Temperature | Average annual lowest temperature 10°C |
| Temperate Zone Temperature | Average annual lowest temperature 5°C |
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What You'll Learn
Tropical, subtropical, temperate, arid and cool/alpine regions
Australia's climate varies from humid sweltering rainforests in the Northern Tropics to the Australian Alps, which receive more annual snowfall than Switzerland. The country can be divided into five main climatic regions: tropical, subtropical, temperate, arid, and cool/alpine.
Tropical Region
The Tropical Region in Australia experiences hot, humid summers and warm winters. This region covers the northern part of the country, including cities such as Canarvon, Port Hedland, Broome, Darwin, Cairns, and Rockhampton. Tropical vegetables such as taro, sweet potato, and cassava are commonly grown here, along with tropical fruits like bananas, mangoes, pineapples, and papayas.
Sub-Tropical Region
The Sub-Tropical Region of Australia enjoys a warm and mild climate, with hot summers and mild winters. This region is ideal for growing a diverse range of crops, including tomatoes, capsicums, eggplants, cucumbers, and zucchinis. It also produces a variety of fruits, such as citrus, avocado, and macadamia nuts. One of the challenges in this region is managing occasional droughts, which growers address through drip irrigation systems and drought-tolerant crop selections.
Temperate Region
The Temperate Region experiences warm summers and cool winters. This zone covers a large area, extending from inland Queensland to the New South Wales tablelands, the coastal region south of Sydney, and much of southern coastal Australia, including Melbourne, Adelaide, and Perth. While this region offers a more moderate climate, it is important to consider heat tolerance when selecting plants, as prolonged exposure to heat can damage or kill them.
Arid Region
The Arid Region of Australia presents unique challenges for growers due to its hot and dry conditions. Water conservation is a critical concern, and growers often employ techniques like drip irrigation and mulching to reduce water usage. This region is suitable for growing heat-tolerant crops such as tomatoes, eggplants, capsicums, and beans.
Cool/Alpine Region
The Cool/Alpine Region includes coastal areas of southeastern Australia and alpine areas of Victoria, New South Wales, and Tasmania. Gardeners in these regions experience shorter growing seasons compared to those in cool coastal areas. To accommodate the shorter seasons, gardeners in cool regions are advised to choose plant varieties with shorter 'days to maturity', ensuring they can mature within the brief 6-12 week growing season. Additionally, microclimates within these regions may further influence the choice of plants, as some areas may be prone to frosts and snow.
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Hot Humid Zone
Australia is divided into several climatic zones, including tropical, subtropical, temperate, arid, and cool/alpine regions. The National Construction Code (NCC) of Australia identifies eight climate zones, while the USDA Plant Hardiness Zones place Australia between zones 7 and 12.
The Hot Humid Zone, also known as the Tropical Region, is one of the climatic zones in Australia. This zone includes the coast of the Northern Territory, Western Australia north of Broome, Cape York, and the northern part of the Queensland coast above Mackay. The temperature remains high throughout the year, and no frost occurs, with an average annual lowest temperature of 15°C.
The Hot Humid Zone is characterised by its distinct monsoon or 'wet season' and 'dry season'. The wet season, which corresponds to summer in southern Australia, is marked by high temperatures and humidity, with an average January maximum temperature exceeding 30°C. The transition to the wet season, typically in November, is considered the least comfortable time of year, as temperatures soar and humidity rises without the relief of cooling rainfall.
The unique challenges of the Hot Humid Zone can be daunting for gardeners, particularly those new to the region. The intense monsoon rains can be destructive, and pest infestations can rapidly destroy crops. Termites, for instance, pose a significant threat. Additionally, the hot and humid conditions can impact plant health, causing withering flower buds, drooping leaves, leaf discolouration, and non-growing roots.
To address these challenges, gardeners in the Hot Humid Zone must select plants suited to the region's climate. This includes choosing crops that can tolerate heat and humidity, as well as those that are resistant to pests and diseases to reduce the need for chemical treatments. Water conservation is also crucial, as water scarcity is a concern. Techniques such as drip irrigation and mulching can help optimise water usage while keeping plants adequately hydrated.
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Temperate Zones
Australia's temperate zones are characterised by warm summers and cool winters. This zone includes inland Queensland, the New South Wales tablelands, the coastal region south of Sydney, and the southern coastal areas of the country, from Melbourne to Perth. The warm temperate zone experiences distinct four seasons, with cool winters that occasionally have light frost, although this is less common on the coast. The ocean moderates the temperature in coastal zones, allowing for a wider range of plants to be grown, including some subtropical varieties. The average annual lowest temperature in these areas is 5°C, and the warm summer months have an average January maximum temperature of less than 30°C.
The temperate zone can be further divided into rainfall and minimum temperature regions to provide a more detailed guide for gardeners. While frost can be a challenge, it also has benefits, such as reducing pest numbers. The temperate zone typically experiences reliable rainfall throughout the year, with an average of 600-800mm, although this can vary with some areas receiving up to 1200mm.
The cool-temperate zone includes the tablelands of southeast Queensland, New South Wales, and Victoria, as well as the uplands of central Tasmania. Winters in these areas are cold, with most nights dropping below 0°C. Frost is common from autumn to spring, and snow often falls in higher areas. The summers are warm to very warm, but with low humidity.
The temperate zones in Australia are distinct from the tropical and subtropical regions, which experience higher temperatures and humidity. The tropical zone includes the north of Australia, with hot, humid summers and warm winters. The subtropical zone includes the eastern coastline from Coffs Harbour to Mackay and experiences mild winters and high humidity from November to March.
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Cool Mountain Region
The Cool Mountain Region is characterised by its high altitude and cool climate, providing a unique set of growing conditions. This region typically experiences cool to cold winters, with frosts and occasional snow, and mild to warm summers. The growing season is shorter compared to other regions, and the cool temperatures mean that heat-loving plants may struggle. However, the cool mountain region is ideal for certain types of plants, including deciduous trees, cool-season vegetables, and alpine species.
Due to the high altitude, this region often has lower atmospheric pressure and reduced oxygen levels, which can affect plant growth. The soil in this region is usually well-drained and acidic, with a high organic matter content. It is important to select plants that are suited to these soil conditions and to ensure adequate drainage to prevent waterlogging.
One of the key considerations for gardening in the cool mountain region is protecting plants from extreme weather conditions. Strong winds can be a concern, so providing shelter or choosing wind-resistant plants is essential. Additionally, the region is prone to frost and snow, which can damage sensitive plants. Strategies such as using frost cloth, mulching, and selecting hardy plant varieties can help mitigate these challenges.
The cool mountain region is suitable for a range of deciduous trees, including birch, maple, and oak. These trees provide stunning displays of colour in autumn and thrive in the cool, moist conditions. Coniferous trees such as pines and spruces are also well-adapted to this region and can provide year-round interest with their evergreen foliage.
When it comes to shrubs and perennials, there are many options suited to the cool mountain region. Rhododendrons, azaleas, and camellias are popular choices, as they prefer acidic soil and perform well in partial shade. Primulas, heucheras, and hostas also thrive in these conditions, adding colour and texture to the garden.
Cool-season vegetables, such as lettuce, spinach, and peas, can be successfully grown in this region. Root vegetables like carrots, parsnips, and potatoes also do well. It's important to start seeds indoors or in a greenhouse to get a head start on the shorter growing season. Using raised beds or containers can also help improve drainage and soil warmth.
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Plant hardiness zones
Australia's plant hardiness zones can be compared to the United States Department of Agriculture (USDA) Hardiness Zones, which are divided into 13 separate planting zones. Each USDA zone is characterised by a 10 °F temperature difference from the adjacent zones, with further subdivisions based on 5 °F temperature differences. While the USDA zones are a useful reference, they don't perfectly align with Australia's unique climate.
To address this, some sources propose creating modified zones that better fit Australia's climatic range. One suggestion is to divide Australia into seven zones, each defined by its average minimum temperature, influenced by factors like altitude, latitude, and proximity to the coast. Zone 1, for example, covers the alpine areas of southeastern Australia, while Zone 2 includes the tablelands of southeast Queensland, New South Wales, and Victoria, as well as central Tasmania.
Australia's plant hardiness zones can be broadly categorised into several regions: the Arid Region, the Cool Mountain Region, the Subtropical Region, the Temperate Region, and the Tropical Region. The Arid Region encompasses desert areas like Kalgoorlie and Alice Springs, as well as dry inland regions of Queensland. The Cool Mountain Region, featuring mild to warm summers and cold winters, covers high-altitude areas in New South Wales, the Northern Tablelands, Southern Tablelands, Canberra, and most of Tasmania.
The Subtropical Region, with its warm and humid summers and mild, dry winters, includes the eastern coastline from Rockhampton to Brisbane and south to Sydney. It also extends along the Western Australian coastline. The Temperate Region, with warm summers and cool winters, spans inland Queensland, New South Wales tablelands, and the coastal region south of Sydney. It also reaches much of southern coastal Australia, including Melbourne, Adelaide, and Perth.
Lastly, the Tropical Region, with its hot and humid summers and warm winters, covers the northern parts of Australia, from Carnarvon to Darwin, Cairns, and south to Rockhampton. This region experiences a distinct monsoon or 'wet season' and 'dry season', with most rain falling during the summer months in southern Australia.
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Frequently asked questions
Australia's climate can be divided into several growing zones. These include the tropical region, the subtropical region, the temperate region, the arid region, and the cool/alpine region.
The tropical region has hot, humid summers and warm winters. It covers the north of Australia, from Canarvon through Port Hedland, Broome, Darwin, Cairns, and south to Rockhampton.
The subtropical region has warm, humid summers and mild, dry winters. It includes the eastern coastline from Coff's Harbour in northern NSW, Brisbane, and north to Mackay and Brisbane.
The temperate region has warm summers and cool winters. It extends from inland Queensland to the New South Wales tablelands and the coastal region south of Sydney, as well as much of southern coastal Australia from Melbourne to Perth.
The arid region includes all the desert areas, such as Kalgoorlie and Alice Springs, as well as the dry inland areas of Queensland.
The cool mountain region has mild or warm summers and cold, frosty winters. It covers the high areas of New South Wales, the Northern Tablelands, the Southern Tablelands, Canberra, and most of Tasmania.
