Spiraea japonica
This largish Spiraea japonica was in our back yard when we bought the house. Every few years I cut it back quite hard and it rewards us with a wonderful show of airy, white blossoms each spring. There’s actually a cherry seedling growing up through the middle of it, which I need to chop down one of these days, but that’s neither here nor there. The small white flowers are pretty on their own but of course it’s the effect of a seven foot shrub covered in them that’s the real show. Aside from the occasional once over with a hedge trimmer, it takes virtually no work at all.