Gardening and Nature When to Prune Hydrangea by A. JoAnn Posted on 07/18/201705/02/2018 A good rule of thumb is to prune any of these varieties soon after they have finished blooming. Share this: Click to share on Facebook (Opens in new window) Facebook Click to share on Pinterest (Opens in new window) Pinterest Click to email a link to a friend (Opens in new window) Email Click to share on Reddit (Opens in new window) Reddit Click to share on WhatsApp (Opens in new window) WhatsApp Click to share on X (Opens in new window) X Read More