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It has been adapted by and to other countries (such as Canada) in various forms. A plant may be described as "hardy to zone 10": this means that the plant can withstand a minimum temperature of 30 to 40 °F (−1.1 to 4.4 °C). Unless otherwise specified, in American contexts "hardiness zone" or simply "zone" usually refers to the USDA scale.
Polyculture systems, such as intercropping or companion planting, offer more diversity and complexity within the same season or rotation. An example is the Three Sisters, the inter-planting of corn with pole beans and vining squash or pumpkins. In this system, the beans provide nitrogen; the corn provides support for the beans and a "screen ...
Those gardening in horticultural zones higher than 9 can ignore this advice, as the southernmost parts of the continental U.S., as well as Puerto Rico and Hawaii, are considered frost-free (there ...
Growing degree days (GDD), also called growing degree units (GDUs), are a heuristic tool in phenology.GDD are a measure of heat accumulation used by horticulturists, gardeners, and farmers to predict plant and animal development rates such as the date that a flower will bloom, an insect will emerge from dormancy, or a crop will reach maturity.
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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Zone 4 may refer to: Hardiness zone, a geographically defined zone in which a specific category of plant life is capable of growing; Marcory Zone 4, one of the four zones of Marcory, Abidjan, Ivory Coast; Travelcard Zone 4, of the Transport for London zonal system; Zone 4 (record label), a record label created by producer Polow da Don; Zone 4 ...
The Trump Economy Begins: 4 Money Moves Retirees Should Make Before Inauguration Day. 3 Things Retirees Should Sell To Build Their Retirement Savings.
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