Hardiness zone

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UK hardiness zones from 7 (bright green) to 10 (orange)

A hardiness zone (a subcategory of Vertical Zonation) is a geographically defined area in which a specific category of plant life is capable of growing, as defined by climatic conditions, including its ability to withstand the minimum temperatures of the zone.

For example, a plant that is described as "hardy to zone 10" means that the plant can withstand a minimum temperature of -1°C. A more resilient plant that is "hardy to zone 9" can tolerate a minimum temperature of -7°C.

Hardiness zones table[edit]

Hardiness zoneLowest temperature
0< −51.1°C (−60°F)
1−51.1°C (−60°F)
2−45.6°C (−50°F)
3−40°C (−40°F)
4−34.4°C (−30°F)
5−28.9°C (−20°F)
6−23.3°C (−10°F)
7−17.8°C (0°F)
8−12.2°C (10°F)
9−6.7°C (20°F)
10−1.1°C (30°F)
11+4.4°C (40°F)
12> +10°C (50°F)

WikiGardener[edit]

WikiGardener uses the hardiness zone scale to indicate where a plant grows best outdoors. It is entirely possible to grow plants outside of the advised zones. With the correct equipment a plant could be grown in controlled conditions in any environment.

Hardiness zone maps[edit]

Europe  
United States of America  

References[edit]

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