Cascade hydrangeas are the newest type of hydrangea, and they are stunning! Hardy to USDA Hardiness zone 6 to 9, these hydrangeas are hybrids of several types with a unique ability to set blooms ...

plant hardiness zones have shifted north toward higher latitudes and elevations. As minimum temperatures warm and a location's planting zone increases (e.g., from Zone 5 to Zone 6), certain ...

Plant hardiness zones represent the 30-year average of the coldest temperature at each location across the country. Zones increase with each 10-degree Fahrenheit (5.6-degree Celsius) interval.

The importance of hardiness zones lies in their ability to help gardeners and farmers choose plants that will thrive in their ...