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According to the new map released in November 2023, about half of the United States has shifted to a new hardiness zone. That's really big news if you consider 80 million Americans use this map to ...
For practical purposes, Canada has adopted the American hardiness zone classification system. The 1990 version of the USDA Plant Hardiness Zone Map included Canada and Mexico, but they were removed with the 2012 update to focus on the United States and Puerto Rico. [8] The Canadian government publishes both Canadian and USDA-style zone maps. [37]
Here's how the USDA Plant Hardiness Zone Map helps you determine which plants are most likely to thrive in your garden. ... 2024 at 12:54 PM. Whenever you purchase a new perennial plant, ...
As of the most recent release, the November 2023 map has the US broken into 13 cold hardiness zones in 10-degree Fahrenheit intervals, with each zone further broken into “a” (the warmer half ...
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 USDA rejected the AHS 2003 draft map; the agency stated it would create its own map in an interactive computer format. As of August 2010 the AHS and the National Arboretum websites still present the 1990 map as current. In 2006, the US National Arbor Day Foundation completed an extensive updating of U.S. Hardiness Zones. It used essentially ...
That compares to the fewer than 8,000 stations used for the 2012 map, according to the USDA. The new 2023 map also is divided into 10-degree Fahrenheit zones and further divided into 5-degree ...
Rehder created the first system of isothermic zones for the United States that related average winter minimum temperatures to the hardiness of specific plants. The system, along with another developed by Wladimir Köppen, is the basis for the USDA Hardiness zone maps in use today. In 1913, Harvard conferred upon him an honorary Master of Arts ...