This plant looks good. It weathered well this winter. I can’t tell what the exposure is for fun shade but please make sure it is watered well, fresh rain water is best.  If you haven’t done so perhaps a soil test will help you know what nutrients are in the soil. This information will then tell you if fertilizer is necessary. 
 
https://agsci.psu.edu/aasl/soil-testing

The dried stalks can be removed as soon as they “snap” easily at the base. Don’t force them. Applying mulch is a common practice but getting a soil test first is recommended before mulch is applied.  Mulch can hold moisture and heat that may not be necessary.
https://plants.ces.ncsu.edu/plants/hydrangea-macrophylla-glowing-embers/
This link will take you to a site that provides details about this particular species.  Note that it has poisonous attributes for pets. 
Keep taking pictures as it grows into spring.