Hydrangea arborescans, Smooth Hydrangea

Smooth hydrangea
Hydrangea arborescans 

Hardiness: Zones 3 to 9
Plant type: Shrub
Height: 3 - 5'
Spread: 4 - 6'
Sun: Part shade
Water: Medium
Bloom time: June to September
Bloom color: White
Soil: Average, slightly acidic, well-drained soils

Notes: Bloom occurs on new wood, so plants may be pruned back close to the ground in late winter to revitalize and to encourage vigorous stem growth and best form. Wildlife Food Source.

More information on this plant here.