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USDA Hardiness Zone Map: This map indicates the average annual minimum temperatures in the United States. My rule of thumb is to select the majority of plants for the garden hardy one zone north of the garden's zone (unless you live in the southern portion of a zone). With most plants safe because they've been selected appropriately, one can experiment with plants marginal in the zone. Australian Zone Map: for an Australian Plant Hardiness Map (which has an excellent overview of Zone Maps in general), click here.
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