Several of these shrub like plants are planted along the back of my property. I had them cut back pretty extensively and wonder if they'll be able to come back. Some of them are around 6-7 feet tall. They have large finger like leaves with large white blooms that turn dark in August. I have attached a couple of pictures.
Greenup County Kentucky
This is oakleaf hydrangea Hydrangea quercifolia. It's a great shrub. Cutting these back hard is something I wouldn't normally suggest. My book on hydrangeas says that any pruning should be done after flowering is done as they develop buds on old wood. There are a number of dwarf cultivars of oakleaf hydrangea if you decide to replace these with a smaller version instead of pruning hard. I absolutely love this plant.
More info here: http://www.missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.aspx?kempercode=d380