Hydrangea macrophylla 'Lanarth White'
Lanarth White Hydrangea features bold white lacecap flowers with powder blue overtones at the ends of the branches from early summer to early fall. The flowers are excellent for cutting. It has green deciduous foliage. The serrated pointy leaves do not develop any appreciable fall color.
Will grow to be about 5 feet tall at maturity, with a spread of 6 feet.
This shrub does best in full sun to partial shade. You may want to keep it away from hot, dry locations that receive direct afternoon sun or which get reflected sunlight, such as against the south side of a white wall.