This is Breathtakingly Beautiful Bridal Wreath Spirea. (Spiraea prunifolia).
I really cannot verify what the exact variety of my particular shrub because it was here when I brought this property 20 some years ago. I love it for so many reasons. When this shrub is in full bloom it resembles a fountain of amazing small clusters of white flowers. The blooms extend all the way down the arching canes.
The name comes from the fact that the canes thru the ages have been shaped into a wreath and worn by brides as a headdress for the special day. Very Special!!
I transplanted a great deal of this shrub to the back fence row about 10 years ago. Now it puts on such an impressive show. My variety grows to over 6 ft tall and is very full. It seems to prefer full sun but does fine in partial shade. They love it out in the field and it provides such a beautiful screen along the fence row.
This shrub easily transplanted and by doing this task, it allowed my Kerria japonica with its yellow puff blooms to magnificently fill in the gaps. Making for quite an impressive show in the spring.