Hydrangea quercifolia or Oakleaf Hydrangea is a small deciduous shrub reaching about 6′ tall about the same if not more in spread. Growing in full sun to full shade this North America native shrub is a consistent bloomer and easy to care for. 
What I find appealing to about this plant is the lack of any maintenance that is needed through the growing season. Some hydrangeas need timely pruning or the addition of special fertilizers to keep their blooms blue, white, or whatever color they have been hybridized to show. Oakleaf are forgiving and do not need anything special. However, newly installed plants should have some hardware cloth put around the base to keep voles from doing any damage.
One of the standout features of this plant besides the flowers and the oak shape leaves is the bark. The bark is exfoliating leaving behind an attractive cinnamon/orange new growth. Bark is often overlooked when choosing shrubs or trees as an ornamental feature. Young twigs are also attractive with their fuzzy orange/brown appearance.
I do need to caution you, this plant is visited by the Japanese beetles and can have some serious defoliation if the insect pressure is high. Aphids and spider mites are two other potential pests that can be managed with strong streams of water.
So if you are in the market for a new shrub this might be something to put on your short list.
