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  2. Hardiness zone - Wikipedia

    en.wikipedia.org/wiki/Hardiness_zone

    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.

  3. List of Northern American nectar sources for honey bees

    en.wikipedia.org/wiki/List_of_Northern_American...

    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]

  4. When to start planting seeds indoors? Check your frost date - AOL

    www.aol.com/news/start-planting-seeds-indoors...

    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 ...

  5. List of California native plants - Wikipedia

    en.wikipedia.org/wiki/List_of_California_native...

    A 2001 study by the California Native Plant Society estimated 6,300 native plants. These estimates continue to change over time. [2] Of California's total plant population, 2,153 species, subspecies, and varieties are endemic and native to California alone, according to the 1993 Jepson Manual study. [4]

  6. Flora of the Sierra Nevada alpine zone - Wikipedia

    en.wikipedia.org/wiki/Flora_of_the_Sierra_Nevada...

    The alpine zone, or alpine fell-field, is above the tree line, generally at 11,000 to 11,500 feet (3,400 to 3,500 m) in the south, [4] [5]: 8 and 9,900 feet (3,000 m) [6]: 17 to 10,500 feet (3,200 m) [4] in the north. The plants are influenced by having to endure long and very cold winters, poor to no soils, constant high winds, intense ...

  7. Growing degree-day - Wikipedia

    en.wikipedia.org/wiki/Growing_degree-day

    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.

  8. List of plants of the Sierra Nevada (U.S.) - Wikipedia

    en.wikipedia.org/wiki/List_of_plants_of_the...

    Note: references for each plant species are within their own articles. Bibliography of the Sierra Nevada (U.S.) "A Natural History of California," Allan A. Schoenherr, University of California Press, 1992, ISBN 0-520-06922-6. "A California Flora and Supplement," Phillip Munz, 1968, University of California Press, ISBN 0-520-02405-2.

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