What is the name of the system that identifies the area of the U.S. where a plant species can survive, based on minimum temperature?

The correct term for the system that identifies the areas in the U.S. where a plant species can thrive, specifically based on the minimum temperatures, is known as the plant hardiness zone. This system, developed by the USDA, divides regions into zones that indicate the minimum temperatures plants can withstand. It serves as a critical guide for gardeners and horticulturists in selecting appropriate plant species that will flourish in their local climate conditions.

The other terms listed—growth region, environmental adaptation zone, and floral preservation area—do not specifically reference the temperature-based classification system used for assessing plant survival. While they may relate to concepts in agriculture or ecology, they lack the specificity and utility of the plant hardiness zone in horticultural practice.