Which zone has an average minimum temperature of 20-25 degrees F?

The zone characterized by an average minimum temperature of 20-25 degrees Fahrenheit is indeed Zone 9a. This classification is part of the USDA Plant Hardiness Zone Map, which helps gardeners and growers determine which plants are most likely to thrive in their location based on temperature ranges. Zone 9a specifically indicates that the average minimum temperature during the coldest part of the year can drop to as low as 20 degrees, but generally, it remains above that level, lending to a milder climate suitable for a variety of plants that cannot survive in colder zones.

Understanding this classification is crucial for horticulturists as it informs them about the types of plants that can be successfully cultivated in their area, considering factors such as frost tolerance and heat requirement. This knowledge helps in making informed decisions regarding plant selection and care.