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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. [20]
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]
Map of average growing season length from "Geography of Ohio," 1923. A season is a division of the year marked by changes in weather, ecology, and the amount of daylight. The growing season is that portion of the year in which local conditions (i.e. rainfall, temperature, daylight) permit normal plant growth.
A week before the last frost date, begin to “harden off” plants by placing them outdoors for incrementally longer periods each day. When to start planting seeds indoors? Check your frost date
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The first tree was an Austrian pine planted on the H.E. Curtis farm near Willow, Oklahoma, on March 18. [3] The project called for large-scale planting of trees across the Great Plains, stretching in a 100-mile wide zone from Canada to northern Texas, to protect the land from wind erosion.
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 ...
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