North Central Regional Plant Introduction Station, Agronomy
Journal or Book Title
Landscape Plant News
There are many climatic factors that can limit the adaptation of woody landscape plants. In the North Central United States, one of the most widely studied limiting factors is winter injury caused by low temperatures. Mean annual minimum temperature is the basis for the USDA Plant Hardiness Zone Map (Cathey, 1990), which is perhaps the most well-known guide for defining woody plant adaptation in the region.
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Widrlechner, Mark P., "A Zone Map for Mean Annual Moisture Balance in the North Central United States" (1999). NCRPIS Publications and Papers. 57.