Garden Zones. Based on the minimum ten-year average winter temperatures, plant hardiness zone maps have been progressively developed, first by the Department of Agriculture (USDA) for the United States and then more or less applied to the rest of the planet. Some plants might not survive over winter!
Canada's plant hardiness map provides insights about what can grow where.
Canada Plant Hardiness: Ontario If you know your hardiness zone, find the best plants or exciting garden ideas for your geographic area.
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Have a look at the map and find the number for your area for growing plants, trees, shrubs, and vines, including annuals and perennials. Cold hardiness zones — zones based on the average lowest temperature in your area of the country — help determine which plants will flourish in your landscape. Even within your yard's climate zone, variations in exposure and topography can affect plants.
