Answer: If the stems are truly dead they can be cut off, but it is worth waiting a little longer to make sure they are not going to bud anywhere else beginning from the bottom up. Sometimes it takes them a while to gather their strength, in the meantime they look sort of ... dead. You would cut just above the last live growth taking care not to damage that. This hydrangea blooms on both old and new wood. The buds on the old stems open first followed by the buds that form on new wood. So to have the full range of bloom season you need both old and new. Enjoy your Endless Summer!
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