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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. The original and most widely used system, developed by the United States Department of Agriculture (USDA) as a rough guide for ...
Various hardiness ratings are published. In the United States (US), the most widely used is the U.S. Department of Agriculture (USDA) system of hardiness zones based on average minimum yearly temperatures. This system was developed specifically for the extremely diverse range of conditions in the US, from baking desert to frozen tundra.
Flora of the United States. The native flora of the United States includes about 17,000 species of vascular plants, plus tens of thousands of additional species of other plants and plant-like organisms such as algae, lichens and other fungi, and mosses. About 3,800 additional non-native species of vascular plants are recorded as established ...
The new data is based on 1991-2020 GIS data collected from over 13,000 weather stations.
Kudzu is an invasive plant species in the United States, introduced from Asia with devastating environmental consequences, [1] earning it the nickname "the vine that ate the South". It has been spreading rapidly in the Southern United States, "easily outpacing the use of herbicide, spraying, and mowing, as well increasing the costs of these ...
The Foreign-Trade Zones Act was one of two key pieces of legislation passed in 1934 in an attempt to mitigate some of the destructive effects of the Smoot-Hawley Tariffs, which had been imposed in 1930. The Foreign-Trade Zones Act was created to "expedite and encourage foreign commerce" in the United States. Through World War II, manufacturing ...