(The United States falls within Zones 2 through 10). Gardeners rely on USDA Hardiness Zone Maps to tell us which plants survive and thrive locally. Back to the main Hardiness Zones page. by Iain Dawson (Horticultural Research Unit, ANBG) 1991 (Iain has since retired from the Australian National Botanic Gardens) Plant hardiness maps allow producers to label their plants as being suitable for particular areas, and, in theory at least, this results in happy customers who can confidently buy plants that will survive in their locality. USDA Unveils New Plant Hardiness Zone Map By Kim Kaplan January 25, 2012 WASHINGTON—The U.S. Department of Agriculture (USDA) today released the new version of its Plant Hardiness Zone Map (PHZM), updating a useful tool for gardeners and researchers for the first time since 1990 with greater accuracy and detail. Interactive USDA Grow Zone Map Find Seeds Tool Plant Hardiness Find seeds and plants that grow in your zone (US & Canada). The map is divided into thirteen distinct 10ºF zones, which are further divided into sub-zones of 5°F. The USDA released updated Plant Hardiness Zone Maps for the United States. The United States Depa rtment of Agriculture (USDA) has released the first new USDA Plant Hardiness Zone Map since 1990. The map is based on the average annual minimum winter temperature, divided into 10-degree F zones. All plants are hardy in Eastern Massachusetts Zone 6.Check the hardiness zone in your area prior to ordering! These are areas which range in minimum temperatures from -60 degrees Fahrenheit to 70 degrees Fahrenheit. Home; Holiday Shops; Contact Us; Back To WestonNurseries.com; Hardiness Zone Map. The new map is generally one 5°F half-zone warmer than the previous map throughout much of the United States. For example, the pink areas of the map have warmed up enough to change one hardiness zone (e.g. It is used by the agriculture industry to define what plants grow best in what areas. Understanding Canada Growing Zones Growing zones in Canada are divided into nine zones ranging from 0, where weather is extremely harsh, to zone 8 which comprises certain areas along the west coast of British Columbia. (Figure source: NOAA). This is mostly a result of using temperature data from a longer and more recent time period; the new map uses data measured at weather stations during the 30-year period 1976-2005. Understand what is meant by a plant hardiness zone. Hardiness Zone Map. As gardeners, farmers and others involved in growing pursuits are aware, the Plant Hardiness Map is used to determine where certain species are most likely to thrive, and this new edition of the map reveals that those locations have shifted. Today the most widely used system is the one first published in 1960 and developed for the United States Department of Agriculture (USDA) by Henry Skinner, the Director of the U.S. National Arboretum at that time. However, an area such as Miami, Florida, (USA) is Zone 10 where the lowest average temperature is only -1.1C. Close search. Skip to content. The map is produced by the U.S. Department of Agriculture (USDA) Agricultural Research Service (ARS) and is available on their website. For example, the lowest average temperature in Zone 2 is -50 to -40 degrees Fahrenheit, while the minimum average temperature in zone 10 is +30 to +40 degrees Fahrenheit. The US Department of Agriculture created the USDA Plant Hardiness Zone Map to provide a standard definition of climatic conditions relevant to plant growth and survival. Plants rated for a range of hardiness zones can usually survive winter in the coldest region as well as tolerate summer heat of the warmest one. CLICK THE MAP TO SELECT YOUR ZONE! Figure 33.31: The map on the left shows the change in Plant Hardiness Zones calculated from those based on the 1971-2000 climate to those based on the 1981-2010 climate. 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