Experts and BHG readers answer.
CUT BACK HYDRANGEA
Yes, it will return, and it may bloom. Some hydrangeas form their flowers on the new wood that grows each year. If yours is that kind, you'll have flowers this year. Otherwise, you won't have flowers until next year. Wait and see!
Mulch your bushes with a nice composted manure or composted leaves this spring. That will help to feed the shrubs as it breaks down. That will encourage new growth.