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The above map covers part of Ontario and Quebec, New Brunswick, Nova Scotia, Prince Edward Island and Newfoundland (but not Labrador). As with all gardening zone maps it should only be used as a rough guide for plant hardiness. The plants rated for Zone 3 and sometimes even those rated for Zone 4 may be grown in areas shown as Zone 2 but not all plants rated for Zone 2 can be grown reliably in all parts of Zone 2. Micro climates, not only in local areas but in different parts of your own property, play a major role in the survival factor of the plants you grow. Even the fact that a plant survives for several years is no guarantee that it is going to prove to be totally hardy because of variations in growing conditions over any particular season. That is part of the excitement and challenge of gardening however, and is a fact of horticultural life no matter what "zone" you are in.
The colour key is a little hard to read on the graphic so I have attempted to reproduce it here. The darker colour in each temperature range is the colder part and the lighter shade is the warmer area.
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Zone 0a |
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Zone 5a |
-29°C to -23°C (-20°F to -10°F) |
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Zone 0b |
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Zone 5b |
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Zone 1a |
Below -45°C (-50°F) |
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Zone 6a |
-23°C to -18°C (-10°F to 0°F) |
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Zone 1b |
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Zone 6b |
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Zone 2a |
-45°C to -39°C (-50°F to -40°F) |
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Zone 7a |
-18°C to -12°C (0°F to 10°F) |
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Zone 2b |
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Zone 7b |
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Zone 3a |
-39°C to -35°C (-40°F to -30°F) |
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Zone 8a |
-12°C to -6°C (10°F to 20°F) |
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Zone 3b |
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Zone 8b |
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Zone 4a |
-35°C to -29°C (-30°F to -20°F) |
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Zone 9a |
-6°C to -1°C (20°F to 30°F) |
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Zone 4b |
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Water |
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The information on this zone map was provided by Agriculture Canada. I clipped it from an old seed catalog several years ago but no longer remember which one. I scanned it with a greyscale handscanner and coloured it with a graphics program. I hope I haven't stepped on anyone's toes by doing this.
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by Hallie du Preez,
all rights reserved.