One of the shrubs that was in our yard when we bought this house is a large viburnum. It’s in the somewhat shady, northern end of the back yard next to a Spiraea. Some years the bloom isn’t anything to mention but this year is one of the best it’s had since we have lived here (over ten years). The individual flowers are not much to speak of the the entire bush, about ten feel tall and equally broad, is absolutely covered with them. It’s not quite pure white but close enough. The birds love this bush and right now, the insects are pretty happy with it, as well. Once the blooming is done, I’m going to do a bit of cutting, because it tends to get too big and it’s been a few years, but for now, we are really enjoying it.