Rebloomer! Dwarf Hydrangea. Blooms on old and new wood.
Pruning: big-leaf hydrangeas cannot be pruned at any point in the year without negatively impacting the flowering. As such, it's best to avoid pruning this type of hydrangea altogether. If portions of the plant were damaged from winter weather, they can be removed in spring when it is clear where the new growth is emerging.
Fertilizing: The key to getting reblooming hydrangeas to produce new-wood flower buds is to keep them growing vigorously all summer. Hence, fertilizer can be beneficial. Apply a granular rose fertilizer in early spring, when the ground has thawed, and again in late spring. Never fertilize after late July; that can interfere with the plant going dormant.