You’ll find hydrangeas growing in hardiness Zones 3 to 7 as perennials. With flowers starting in spring and often last throughout summer into early fall, hydrangea flowers can be the foundation plant of your landscape.

How do I know if my hydrangea is perennial?

Hydrangeas are perennial shrubs, meaning they come back every year, unlike annuals that die off after just one season. That said, sometimes hydrangeas that come from greenhouses or are sold as gift plants are considered annuals because they die off soon and don’t come back after that.

Can hydrangeas stay outside in winter?

Potted Hydrangeas – Winter Protection The best hydrangea winter protection for potted plants is to bring them inside prior to the first frost. If they are too cumbersome to move, they can remain outside and be protected by covering the entire pot and plant.