Knowing your zone will help you find what will grow most successfully in your garden during the different seasons.
The following link on ABC Gardening Australia refers to the Australian Climate Zones and has a list of what you can plant in your garden.
Melbourne has a temperate climate with warm to hot summers, mild and pleasant springs and autumns, and cool winters.
According the following vegie guide, there are things you could grow during all seasons in Melbourne.
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