In gardening, refers either to hardiness zones (geographic areas defined by average annual minimum temperatures, indicating which plants will survive winter) or permaculture zones (areas of the garden ranked by frequency of use).
Australia's climate zones range from tropical (warm year-round) to temperate and cool regions, each with distinct growing seasons and plant suitability. The Australian National Plant Information Service provides zone classifications that help gardeners select appropriate species for their location. For example, tropical zones in far north Queensland experience wet summers (Dec-Feb) with high humidity, while cool temperate zones in Tasmania endure cold winters (Jun-Aug) with potential frost damage.
Knowing your zone is crucial for successful gardening. A plant rated for zones 9-11 won't survive outdoors year-round in cooler zone 7-8 areas of southern Australia. Bunnings and local nurseries typically label plants with their suitable zones, making selection easier. You can discover your zone by checking postcode-based resources from your state's Department of Primary Industries or the Australian Bureau of Meteorology.
Zones also influence planting times and techniques. Spring planting (Sep-Nov) works well in cooler zones, while tropical gardeners often plant during the dry season (May-Oct). Understanding microclimates within your zone—such as frost pockets or sheltered north-facing aspects—allows you to expand your plant palette. Gardeners in borderline zones can use frost cloth, mulching, and strategic positioning near buildings to protect tender plants during vulnerable seasons.