Willis Orchard Company offers a variety of plant health care products to get your plants started, keep plants healthy, and help them grow to their fullest potential. Buy your garden care products today or call us for more information!
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What is a Hardiness Zone?
A hardiness zone is a geographic area defined by average annual minimum winter temperatures, helping gardeners determine which plants can survive in their region. Developed by the USDA, the 13 numerical zones indicate cold hardiness—for example, a plant "hardy to zone 10" tolerates minimum temperatures of 30 to 40 °F (−1.1 to 4.4 °C).
