Hydrangea macrophylla Everlasting Bride 'Hortmabrid' has mopheads of pure white flowers that eventually age to lime green. Plants grow into 3 foot mounds and bloom on both old and new wood. This means you can have flowers even in zone 5 when your hydrangea has died back to the ground!
Asia and the Pacific - Asia - China and Japan
Cool, moist, shaded locations in rich soils of woodlands and along hedgerows and streambanks.