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A hardiness zone is a geographically defined area in which a specific category of plant life is capable of growing as defined by climatic conditions, including its ability to withstand the minimum temperatures of the zone.  For example, a plant that is described as "hardy to zone 10" means that the plant can withstand a temperature of -1° Celcius (30.2 °F).  A more resilient plant that is "hardy to zone 9"  can tolerate a minimum temperature of the zone.

USDA Hardiness Zone Guide - Texas