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Definition

Plant Hardiness Zones: are a guide to help you know which plants thrive in areas of certain temperatures.  The zones are divided into sections by the coldest annual temperatures.  Each plant has a hardiness zone.  You can find this information on seed packets, In online databases and in garden books. 
      In colder regions, gardeners have to be careful not to plant new crops before the winter is over.  Hardiness zones help to figure out when the last frost date is so that the plant starts don’t get frost-bitten roots.

Hawaiian Translation: Ka‘ei Mawa


Example

zone map

This national zone map shows 10 different zones, each of which represents an area of winter hardiness for the plants of agriculture and our natural landscape.  It also introduces zone 11 to represent areas that have average annual minimum temperatures above 40 F (4.4 C) and that are therefore essentially frost-free.

http://www.usna.usda.gov/Hardzone/ushzmap.html


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