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A hardiness zone is a geographic area defined as having a certain range of annual minimum temperature, a factor relevant to the survival of many plants. The Canadian Plant Hardiness Zone map (PHZ Map) system defines 9 zones by long-term average annual extreme minimum temperatures. With 0 having the coldest and 9 the warmest. The zone number designated to each plant species corresponds to the extreme minimum temperatures that plant can withstand. Any plant located in a lower zone then its designation has the potential of not surviving the cold months.View Map