Cold hardiness refers to a plant's ability to survive low temperatures and frost. This characteristic is crucial for many species, especially those in regions with harsh winters. Cold hardiness is often measured by the lowest temperature a plant can tolerate without suffering damage, which varies among different species and cultivars. Factors influencing cold hardiness include the plant's genetic makeup, acclimatization processes, and environmental conditions. For example, evergreen trees typically have higher cold hardiness compared to deciduous trees, as they retain their leaves and can photosynthesize during warmer winter days. Understanding cold hardiness helps gardeners and farmers select appropriate plants for their climate.