Once upon a time, hydrangeas would only bloom once a season. ... Now, you can choose a variety of hydrangeas that bloom all summer long. You can even prune these at any time. Reblooming hydrangeas flower on both new and old growth, meaning you can enjoy flowers from June until the first frost.

How do you get a hydrangea to rebloom?

Keep the plant indoors near a south-facing window or bright artificial light. Provide enough water to keep the soil moist at all times. Move the hydrangea outside in the spring after the chance for frost has passed. Put the hydrangea in a spot where it receives bright morning sun and dappled afternoon shade.

Do you cut off dead hydrangea blooms?

No need to worry – this is simply a sign that it's time to remove the flowers, a process called deadheading. When you deadhead hydrangeas, you aren't harming the plants at all. Removing the spent blooms triggers flowering shrubs to stop producing seeds and instead put their energy toward root and foliage development.