Plants by Post

Hardiness Zones

Hardiness zones are assigned by the USDA based on the average low temperatures of regions across the United States and Canada. A plant is considered “hardy” in a zone if it will weather the winter and act as a perennial. Plants that aren’t “hardy” to your region’s zone usually can be planted as an annual. There are 11 hardiness zones mapped by the USDA, and knowing your zone will help you to select the right plants for your garden.