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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. In some systems other statistics are included in the calculations.
Hardiness of plants is defined by their native extent's geographic location: longitude, latitude and elevation. These attributes are often simplified to a hardiness zone. In temperate latitudes, the term most often describes resistance to cold, or "cold-hardiness", and is generally measured by the lowest temperature a plant can withstand.
The Census Bureau created the metropolitan district for the 1910 census as a standardized classification for large urban centers and their surrounding areas. The original threshold for a metropolitan district was 200,000, but was lowered to 100,000 in 1930 and 50,000 in 1940. [12]
This list of ecoregions in the United States provides an overview of United States ecoregions designated by the U.S. Environmental Protection Agency (EPA) and the Commission for Environmental Cooperation (CEC).
hardiness zone. Warmest hardiness zone maize (corn) 147 172 129 18 3 11 cashew nut: 148 176 132 19 10 11 oats: 183 217 163 23 3 10 lupin (lupine) 195 232 175 25 4 7 kenaf: 230 273 205 29 6 10 calendula: 256 305 229 33 9 11 cotton: 273 325 244 35 8 11 hemp: 305 363 272 39 8 11 soybean: 375 446 335 48 2 11 coffee: 386 459 345 49 10 11 flax ...
Hardy palms are any of the species of palm that are able to withstand brief periods of colder temperatures and even occasional snowfall.A few palms are native to higher elevations of South Asia where true winter conditions occur, while a few others are native to the warmer parts of the temperate zone in southern Europe, and others are native throughout temperate and subtropical locales in the ...
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