Hydrangeas are not deer resistant -- they aren't favorites of animals, but nonetheless, if conditions are sparse enough, deer will certainly resort to eating your hydrangeas. That typically happens in the winter. Mophead, serrata, climbing and oakleaf hydrangeas bloom on old wood. Many other varieties have flowers that bloom on new wood, so wintertime damage might heal before the hydrangeas bloom. But, you don't want deer to consider your yard a buffet. They're creatures of habit, and often return to landscapes that have proven to provide easy meals. For short hydrangeas, we recommend using a wire cage in the winter. For taller hydrangeas, try deer repellant on the reachable branches.