Hydrangea
H x serrata

Sawtooth or Mountain hydrangeas, (also known as Blood-on-the-snow or Tea of Heaven!) are the smallest species at 2-4ft high-wide and most commonly have lacecap type flowers. Flowering on old wood, little pruning is recommended for this type- if needs must prune after flowering. It grows best in light or dappled shade and flowers blue to pink according to soil ph.