What does the term "hardiness zone" refer to in horticulture?

The term "hardiness zone" refers to a geographic area defined by climate conditions that determine the suitability of different plants for growth in that region. Hardiness zones are primarily based on the average minimum temperatures experienced in an area, helping gardeners and horticulturists understand which plants are most likely to thrive in their specific environment.

These zones provide essential information for plant selection, as they guide individuals in choosing varieties that are adapted to withstand the local climate, including temperature extremes and seasonal changes. By understanding the hardiness zone of their location, gardeners can ensure that they select species that will survive and thrive year after year, enhancing the overall success of their horticultural endeavors.

Other choices, such as the soil type, plant height categorization, or pest resistance ratings, do not pertain to the concept of hardiness zones, highlighting the importance of climate conditions in determining plant viability in various geographic regions.