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Hardiness refers to a code attributed to a plant based on its capacity to thrive through winter. It is a useful tool to help you choose the right plant for your region of the country. However, bear in mind that the hardiness zone attribution of a given plant can be affected either up or down by extraneous conditions such as a microclimate, a wind, a heavy blanket of snow, etc. |
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Agriculture Canada has published a map of Canada depicting the hardiness zones right accross the country. The zones are established according to the average minimum winter temperature in a region, the length of periods without freezing, levels of precipitation, degree of humidity and the velocity of dominant winds.
There are ten zones, each given a number from 0 to 9, with 0 being the coldest and 9 the warmest. Each zone has then been divided into sub-zones, with sub-zone "a" slightly colder than sub-zone "b". When you buy a plant, the hardiness zone refers to the zone as depicted on a map. To determine your hardiness zone, please consult Agriculture Canada map. |
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Picture: Agriculture Canada |
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Plants can easily adapt to a warmer hardiness zone. But they might not survive in a colder environment. Even if a plant is available in a store near you, that does not mean it is suited to your region. Therefore we recommend that you carefully read labels before you purchase a plant, and consider information regarding its hardiness zone. |
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