Wondering when the best time to prune rhododendron plants is? My name is Grace, and I’m a Master Gardener with the Master Gardener Volunteer Program through Ohio State University. In this post, I share the latest research-based guidance on when and how to prune rhododendrons to keep them healthy and blooming year after year. You’ll learn the ideal timing, proper pruning techniques, and simple tips to prevent disease and encourage strong growth.