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Hardiness zone information


A hardiness zone is a geographic area defined as having a certain average annual minimum temperature, a factor relevant to the survival of many plants. In some systems other statistics are included in the calculations. The original and most widely used system, developed by the United States Department of Agriculture (USDA) as a rough guide for landscaping and gardening, defines 13 zones by long-term average annual extreme minimum temperatures. It has been adapted by and to other countries (such as Canada) in various forms. A plant may be described as "hardy to zone 10": this means that the plant can withstand a minimum temperature of 30 to 40 °F (−1.1 to 4.4 °C).

Unless otherwise specified, in American contexts "hardiness zone" or simply "zone" usually refers to the USDA scale. However, some confusion can exist in discussing buildings and HVAC, where "climate zone" can refer to the International Energy Conservation Code zones, where Zone 1 is warm and Zone 8 is cold.

Other hardiness rating schemes have been developed as well, such as the UK Royal Horticultural Society and US Sunset Western Garden Book systems. A heat zone (see below) is instead defined by annual high temperatures; the American Horticultural Society (AHS) heat zones use the average number of days per year when the temperature exceeds 30 °C (86 °F).

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Hardiness zone

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A hardiness zone is a geographic area defined as having a certain average annual minimum temperature, a factor relevant to the survival of many plants...

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Hardiness

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(plants), the ability of plants to survive adverse growing conditions Hardiness zone, area in which a category of plants is capable of growing, as defined...

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Zone 2

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Zone 2 may refer to: Travelcard Zone 2, of the Transport for London zonal system Hardiness zone, a geographically defined zone in which a specific category...

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Zone 3

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Zone 3 may refer to: Travelcard Zone 3, of the Transport for London zonal system Hardiness zone 3, a geographically defined zone in which a specific category...

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Climate classification

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disturbances. Examples of empiric classifications include climate zones defined by plant hardiness, evapotranspiration, or associations with certain biomes, as...

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Zone 5

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Zone 5 may refer to: Travelcard Zone 5, of the Transport for London zonal system Hardiness zone, a geographically defined zone in which a specific category...

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Geographical zone

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Climate classification Clime Hardiness zone Polar regions of Earth Subtropics Temperate climate Tropics "The Five Geographical Zones Of The World". WorldAtlas...

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Tropics

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lacking control over nature e.g. 'the wild Amazonian rainforests'. Hardiness zone Tropical ecology Tropical marine climate Tropical year "How much land...

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Zone

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life for an extended time span Frigid zone, a geographical zone on Earth Hardiness zone, a geographically defined zone in which a specific category of plant...

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Ecology of Sydney

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passion vine) Due to the microclimate, the plant hardiness zone in the Sydney area would range: Zone 11a (4.4 to 7.2°C): Sydney CBD Sydney Harbour North...

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Zone 6

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Zone 6 may refer to: Travelcard Zone 6, of the Transport for London zonal system Hardiness zone, a geographically defined zone in which a specific category...

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Zone 1

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Zone 1 may refer to: Hardiness zone, a geographically defined zone in which a specific category of plant life is capable of growing Fare Zone 1, of the...

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List of hardy palms

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Notable Trees". "Trachycarpus fortunei". hardiness.zone. Retrieved 15 August 2020. "Chamaerops humilis". hardiness.zone. Retrieved 15 August 2020. "SPECIES:...

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Caladium bicolor

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(See List of Caladium cultivars.) It can be planted outside in USDA Hardiness Zone 10 as an ornamental. It is a problematic invasive species in Trinidad...

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Begonia grandis

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Hardiness Zone 7. As the common name "hardy begonia" implies, it is winter hardy in some temperate regions. It can overwinter well in hardiness zone 9a...

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Konjac

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Southeast Asia, from China and Japan south to Indonesia and Vietnam (USDA hardiness zone 6–11). It is a perennial plant, growing from a large corm up to 25 cm...

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Zone 9

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Zone 9 may refer to: Travelcard Zones 7-9, of the Transport for London zonal system Hardiness zone, a geographically defined zone in which a specific...

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New Hampshire

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across New Hampshire. The 1990 USDA plant hardiness zones for New Hampshire range from zone 3b in the north to zone 5b in the south. Metropolitan areas in...

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Pocono Mountains

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inches (148 mm) on 09/17/2004. During the winter months, the plant hardiness zone is 5b with an average annual extreme minimum air temperature of −13...

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Zone 8

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Zone 8 may refer to: Travelcard Zones 7-9, of the Transport for London zonal system Hardiness zone, a geographically defined zone in which a specific...

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Brunnera

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the Perennial Plant Association (PPA). Based on the (USDA) Hardiness zone it is hardy in zones 3 to 8. RHS A-Z encyclopedia of garden plants. United Kingdom:...

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Zone 4

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Zone 4 may refer to: Hardiness zone, a geographically defined zone in which a specific category of plant life is capable of growing Marcory Zone 4, one...

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Simrishamn

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because it is warmed by the Gulf Stream and the Baltic Sea, and the hardiness zone of Simrishamn is 8a, comparable to Paris, France. Simrishamn is first...

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Mississippi Delta AVA

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Muscadine grapes. The region has a humid subtropical climate and the hardiness zone ranges from 8b in the south to 7b in some Tennessee portions of the...

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