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Hardiness Zones

Name: Hardiness Zones
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Hardiness Zones

The hardiness zones are informative: the extremes of winter cold are a major determinant of whether a plant species can be cultivated outdoors at a particular location; however, the USDA hardiness zones have a number of drawbacks if used without supplementary information.

The zones do not incorporate summe

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Hardiness Zones

The zones do not incorporate summer heat levels into the zone determination; thus sites which may have the same mean winter minima, but markedly different summer temperatures, will be accorded the same hardiness zone. An extreme example of this phenomenon is seen when comparing the Shetland Islands and southern Alabama, which are both on the boundary of zones 8 and 9 and share the same winter minima, but little else in their climates. In summer, the humid subtropical climate of Alabama is about 20 degrees Celsius hotter than the temperate maritime climate of Shetland, and there are few similar plants that can be grown at both locations. Due to its maritime climate, the UK is in AHS Heat Zone 2 (having 1 to 8 days hotter than 30 degrees Celsius) according to the AHS (American Horticultural Society), whereas Alabama is in Zones 7 to 9 (61 to 150 days hotter than 30 degrees Celsius). Users need to combine the hardiness zone with the heat zone to gain greater understanding of what can be grown in a particular location.

Another issue is that the hardiness zones do not take into account the reliability of the snow cover. Snow acts as an insulator against extreme cold, protecting the root system of hibernating plants. If the snow cover is reliable, the actual temperature to which the roots are exposed will not be as low as the hardiness zone number would indicate. As an example, Quebec City in Canada is located in zone 4, but can rely on an important snow cover every year, making it possible to cultivate plants normally rated for zones 5 or 6. But, in Montreal, located to the southwest in zone 5, it is sometimes difficult to cultivate plants adapted to the zone because of the unreliable snow cover.

Other factors that affect plant survival, though not considered in hardiness zones, are soil moisture, humidity, the number of days of frost, and the risk of a rare catastrophic cold snap. Some risk evaluation – the probability of getting a particularly severe low temperature – often would be more useful than just the average conditions.

Lastly, many plants may survive in a locality but will not flower if the day length is insufficient or if they require vernalization (a particular duration of low temperature). With annuals, the time of planting can often be adjusted to allow growth beyond their normal geographical range.

An alternative means of describing plant hardiness is to use "indicator plants" (the USDA also publishes a list of these to go with the hardiness zone map). In this method, common plants with known limits to their range are used.

Gardening books are available that provide more information on climate zones. For example, Sunset Books (associated with Sunset Magazine) publishes a series that break up climate zones more finely than the USDA zones. They identify 45 distinct zones in the US, incorporating ranges of temperatures in all seasons, precipitation, wind patterns, elevation, and length and structure of the growing season.

Zone	untere Grenze	obere Grenze
1	- - -	unter -45,5° C
2	- 45,5° C	- 40,1° C
3	- 40,0° C	- 34,5° C
4	- 34,4° C	- 28,9° C
5	- 28,8° C	- 23,4° C
6	- 23,3° C	- 17,8° C
7	- 17,7° C	- 12,3° C
8	- 12,2° C	- 6,7° C
9	- 6,6° C	- 1,2° C
10	- 1,1° C	+ 4,4° C
11	+ 4,5° C	+ 10,0° C
12	ab 10,1° C	- - -

European cities

The table herein provides hardiness zone data for some European cities (based on climatological data):

City	Zone	City	Zone
Amsterdam, The Netherlands	8	Antwerp, Belgium	8
Belfast, Northern Ireland	9	Berlin, Germany	7a
Bratislava, Slovakia	7a	Bucharest, Romania	6a
Cardiff, Wales	9	Catania, Italy	10
Copenhagen, Denmark	7a	Cork, Ireland	9b
Dublin, Ireland	9	Düsseldorf, Germany	8
Edinburgh, Scotland	8	Gdańsk, Poland	7
Glasgow, Scotland	9a	Hamburg, Germany	7
Helsinki, Finland	5b	Istanbul, Turkey	8b
Kaliningrad, Russia	6	Kiev, Ukraine	5
Kraków, Poland	6	Lisbon, Portugal	10a
Ljubljana, Slovenia	7	London, England	9a
Madrid, Spain	8-9	Málaga, Spain	10b
Marseille, France	9	Milan, Italy	7-8
Minsk, Belarus	5а	Moscow, Russia	4
Munich, Germany	6	Murmansk, Russia	5
Nicosia, Cyprus	10b	Oslo, Norway	6
Simferopol, Ukraine	7a	Palma, Spain	10
Paris, France	8a	Poznań, Poland	7a
Prague, Czech Republic	7a	Reykjavík, Iceland	7
Riga, Latvia	6	Rome, Italy	9b
Rovaniemi, Finland	4	Saint Petersburg, Russia	5a
Sarajevo, Bosnia and Herzegovina	7	Santander, Spain	10a
Simrishamn, Sweden	8a	Sochi, Russia	9
Sofia, Bulgaria	6	Stockholm, Sweden	6a
Strasbourg, France	7	Tallinn, Estonia	5
Tuapse, Russia	8	Tórshavn, Faroe Islands	7-8
Tromsø, Norway	7	Trondheim, Norway	6
Umeå, Sweden	5	Vienna, Austria	6-7
Vilnius, Lithuania	5	Vorkuta, Russia	2
Valletta, Malta	10b	Warsaw, Poland	6
Zürich, Switzerland	7

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