Zone of cold hardiness refers to the plant's ability to survive the winter. Plant Sci. In that comparison, most of the conterminous United States was one half zone warmer in the period 19912005 than in 197690. Each numbered zone has also been divided into "a" and "b" zones. Map of plant hardiness zones in Canada. 4 Mar. To read each map, click on the picture or header to see the full-size map. USDA Zones 4a through 9a are represented in Washington. An approach toward the rational classification of climate, Census 2000 PHC-T-29. Three key aspects of woody-plant adaptation can be gleaned from Fig. To help develop the new map, USDA and OSU requested that horticultural and climatic experts review the zones in their geographic area, and trial versions of the new map were revised based on their expert input. 2). Zone maps are tools that show where various permanent landscape plants can adapt. Plant cold hardiness: From the laboratory to the field. & Kurdyuk, A.M. 1994 Teoreticheskie osnovy i opyt introduktsii drevesnykh rastenii v Ukraine. In contrast, the standard deviation is lowest [ 2 C (3.6 F)] in the Central Valley of California and the desert southwestern United States; there, it is unlikely that minimum-temperature conditions in any given year varied significantly from the mapped zone. Astilbe. The map is based on the average annual minimum winter temperature, divided into 10-degree F zones and further divided into 5-degree F half-zones. Augustana College, Sioux Falls, SD. Southern Book Publishers, Halfway House, South Africa. The PHZM zip code tools generate a hardiness-zone value based on the geographic center for each five-digit zip code region in the United States. PRISM 19762005 map of standard deviation of the plant hardiness statistic for the conterminous United States. 9 Aug. 2010. Low temperature during the winter is a crucial factor in the survival of plants at specific locations.
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