I have growing in my garden a wildflower that I allow to grow because it is so pretty!! The closest picture I can find to it is Knotweed however this is distinctive because the leaf has a circle of darker colour on it? The flowers are pinkish/purple and are compact growing like a grass flower on a straight stalk at the top of the plant. I'm in the Huron Lake region. Anyone have any idea what this beauty is called?