I have no idea at all what this is. I spotted it out walking, as I tend to do. The flower 'balls' are about the size of a pound coin, or a quarter. Some hard green ones (just in evidence on the bottom of the photo) and others in full 'bloom'. A bush, with reasonably big leaves. Any ideas?
I've never even heard of a Button Bush, so what a delight to encounter something new! I'd love to have these in a garden...they're just fun to look at and such spherical perfection!