Answer: Your hydrangea will bloom only once each year, so what it has produced is all that you'll get this season. As long as the blossoms are fully open and fully colored you can cut them and hang them upside-down to dry. Removing them will help your shrub regain its appearance. If yours is the kind that freezes down to the ground each winter, it will flower on new wood. If the stems remain during the winter, it's the kind of hydrangea that flowers on shoots that grow from previous year's wood. Take that into consideration as you're pruning back your shrub to make it fit into its place in the garden. Pruning now won't hurt the plant.
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