USDA hardiness zone is a geographical categorization of area in which a specific type of plants are capable of growing, defined by many climatic conditions, including its ability to withstand the minimum temperatures of the zone. For example, a plant that is described as “hardy to zone 11” means that the plant can withstand a minimum temperature of +4 °C. Hardiness zones are developed by the United States Department of Agriculture (USDA), use of the zones has been adopted by the other countries.

There is no specific categorization for the other countries than the USA but minimum temperature to a region is used to define the region’s USDA hardiness zone. Most of the tropics and sub tropic areas in India fit somewhere in zones between 10 – 12, Delhi NCR falls in zone 10.

USDA Zone 0a: To -53 °C
USDA Zone 0b: To -48 °C

USDA Zone 1a: To -48 °C
USDA Zone 1b: To -45 °C

USDA Zone 2a: To -45 °C
USDA Zone 2b: To -40 °C

USDA Zone 3a: To -40 °C
USDA Zone 3b: To -35 °C

USDA Zone 4a: To -35 °C
USDA Zone 4b: To -29 °C

USDA Zone 5a: To -29 °C
USDA Zone 5b: To -23 °C

USDA Zone 6a: To -23 °C
USDA Zone 6b: To -18 °C

USDA Zone 7a: To -18 °C
USDA Zone 7b: To -12 °C

USDA Zone 8a: To -12°C
USDA Zone 8b: To -7 °C

USDA Zone 9a: To -7 °C
USDA Zone 9b: To -1 °C

USDA Zone 10a: To -1 °C
USDA Zone 10b: To +4 °C

USDA Zone 11a: To +4 °C
USDA Zone 11b: To +10 °C

USDA Zone 12a: To +10 °C
USDA Zone 12b: To +12 °C

USDA Zone 13a: To +12 °C
USDA Zone 13b: To +15 °C

India Hardiness Zones -Mashrita Nature Cloud

Reference : Wiki and other sites, Image Credit -Davis Landscape Architecture.

Comments(13)

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