Some or other flower

Staying in rented accommodation where someone else tends the garden means I enjoy looking at the flowers but am making no effort to find out what they are. I've no idea what these big balls of loveliness are called. (Tho' they're very common place - and they'll have a name that I'm sure I'll recognise when I hear it)
I promise to do better to learn about such things when I have my own garden.