How do I protect hydrangeas from frost damage?

To protect hydrangeas from frost, you need to take action earlier before the temperature reaches 32°F. Different varieties of hydrangea require different treatments, depending on their cold hardiness. I first start covering my Bigleaf hydrangeas when the forecast shows nightly lows of 40°F. The timing of your preventative measures will directly affect how many buds survive.

Install protective coverings properly before freezing nights. Use burlap and drape it over plants, securing it with stakes. Allow for 6 inches of ground clearance to ensure air circulation. I sometimes stuff straw inside if it's going to be extremely cold. This has saved my hydrangeas in the event of a sudden drop in temperature!

*Construct Frame Structures* for at-risk cultivars in windy locations, using wood frames covered in burlap angled toward prevailing winds. I have clients in Wisconsin who report success with this design. Ensure that structures can withstand snow loads typical to your area.

Watch For Ice Layers After Thaw. Ice can smother plants, preventing them from exchanging air. Remove with careful planning with warm water slowly. Avoid using salt products, as they can damage your soil. I prefer using turkey basters to apply water in this way, which helps protect the buds.

Utilize combined methods of protection for the best efficacy. For example, layering root mulch with wind barriers and covers. I check the plants weekly or every other week, adjusting the protection as needed. Regular attention to the plants will minimize frost damage and yield blooms in the summer.

Read the full article: Essential Hydrangea Winter Care Guide