Do I need to dehead my hydrangea bush? It is budding but I don't want
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No don't cut back, just cut dead growth that is right above new buds.
Your'e supposed to cut them back during the coldest time of the winter. And there's a special way to cut back.
https://www.houzz.com/ideabooks/80945769/list/when-is-the-right-time-to-prune-your-hydrangeas?m_refid=olm_google_176596187_9774874547_dsa-88786447067&pos=1t1&device=c&nw=g&matchtype=b&gclid=COrK3f7vq9MCFZePswodPh4F8Q
Most Hydrangea bloom from old wood. Wait until the new growth emerges and you will be able to tell what needs to be pruned.