"USDA Plant Hardiness Zone Map is the standard by which gardeners and growers can determine which plants are most likely to thrive at a location. The map is based on the average annual minimum winter temperature, divided into 10-degree F zones."What it really means: The USDA Plant Hardiness Zone Map helps determine which plants are unlikely to die of cold weather at a location, not thrive. There are many other reasons your location will kill unsuitable plants. The picture below shows part of the problem.
|Both city parks are in USDA Hardiness Zone 10|