This is one of my love-hate plants. I like to have some in my garden but find it difficult to care for. I don't know how or when to properly prune them and usually end up with stocky and woody plants that I eventually yard out and replace with a fresh start. What do you do in the fall? I've deadheaded all the flower stalks, but am unclear if I should also trim back (or not) the remaining foliage.
