A plant's performance is governed by many climate related factors including the length of the growing season, the amount of rainfall, winter lows, summer highs, wind or humidity.
Various initiatives have taken place to determine how well plants would withstand the cold winter temperatures (Plant Hardiness Zones) or when plants would start suffering from the heat (Plant Heat Zones).
A more sophisticated approach has been followed by Sunset which defines Climate Zone Maps based not only on hardiness or heat tolerance, but also on precipitations, wind, humidity and various other climate related factors.
Be aware of the hardiness zone of your area before you decide to buy plants. Some plants might not survive over winter! Canada's plant hardiness map provides insights about what can grow where. It combines information about a variety of climatic conditions across the entire country to produce a single map.
The USDA Hardiness Zone Map divides North America into 13 zones of 10°F each, ranging from -60°F (-51°C) to 70°F (21°C). If you are planning to buy a shrub, perennial or tree, you need to make sure that this new plant will tolerate year-round conditions in your area.
France lies in USDA Plant Hardiness Zones 6 through 10 with some variations across regions and seasons. However, generally speaking, France enjoys 4 distinct seasons characterized by cool winters and mild summers, but mild winters and hot summers along the Mediterranean with occasional strong, cold, dry, north-to-northwesterly wind known as 'Mistral
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