Will my plants thrive and bloom in the coming years? This is the most important question when purchasing flowers or shrubs for your garden. Always check the label carefully!
Plant Hardiness Zones are the standard by which gardeners and growers can determine which plants are most likely to thrive in their location. Maps are based on the average annual minimum winter temperatures, divided into 10-degree Fahrenheit zones.
Due to the moderating effect which the North Atlantic Current has on the Irish and British temperate maritime climate, Britain, and Ireland even more so, have milder winters than their northerly position would otherwise afford. This means that the hardiness zones relevant to Britain and Ireland are quite high. Huge landmasses of the interior in Nord America have a much rougher climate: hot summer and ice-cold winter temperatures.
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Another phenomenon is that relatively small areas or an island often consist of several hardiness zones. For example, Vancouver Island, north-west of Seattle stretches over four different zones: from Victoria to the Elkhorn Mountain, which rises more than 7,000 feet above the Pacific Ocean.
USDA Plant Hardiness Zones
Maximum lowest temperatures in Fahrenheit
USDA Plant Hardiness Zone Map
https://planthardiness.ars.usda.gov/
5a -20 to -15 F
5b -15 to -10 F
6a -10 to -5 F
6b -5 to 0 F
7a 0 to 5 F
7b 5 to 10 F
8a 10 to 15 F
8b 15 to 20 F
9a 20 to 25 F
9b 25 to 30 F
10a 30 to 35 F
10b 35 to 40 F
11 Above 40 F
European Hardiness Zones can be found here:
https://en.wikipedia.org/wiki/Hardiness_zone#European_hardiness_zones
And here are the Canadian Plant Hardiness Zones:
http://bit.ly/2QsaN4b
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