If it's in bloom right now, it appears to be Hydrangea arborescens
'Annabelle' or possibly 'Grandiflora'. It's hard to tell until it matures a
bit, as 'Annabelle's flower heads seem to get larger and larger as the plant
settles in. The apple green blossom color is a good clue..... it should move
from apple green to white to brown.
Hard to tell from your single photo, but kind of looks like the bloom is more
elongated than ball-shaped. So could be a PeeGee Hydrangea. Leaves and stems
look right for it too. Keep an eye on the bloom...if I'm right, it should
eventually turn light pink.
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