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In Iowa, zones from 4 to 6. In late 2023, the USDA updated the Plant Hardiness Zone Map, moving Iowa into a slightly warmer region of the map, ranging from zones 4 to 6.. Ames and much of Des ...
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]
The Jordan Aquifer is the largest source of groundwater, extending from northeast Iowa to south central Iowa, and is the source of much of Iowa's agricultural and industrial water. Besides pollution, the aquifer is threatened by overuse in well-source irrigation, ethanol production, and decreased replenishment caused by extensive field tilling.
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.
Knowing which planting zone you live in goes a long way toward maintaining a successful, long-lasting garden based on your location's climate and environment.
Hopkins' bioclimatic law states that in North America east of the Rockies, a 130-m (400-foot) increase in elevation, a 4° change in latitude North (444.48 km), or a 10° change in longitude East (two-thirds of a time zone) will cause a biological event to occur four days later in the spring or four days earlier in the fall. [1]
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