Verbenia Bonariensis

Ten years ago when I was living in Southern California, verbenia bonariensis was trendy. Everybody was talking about it and how wonderully it worked as a 'see through' plant. I had a few plants growing in my rose bed. I liked it because it was easy, had a presence and looked good as a cut flower with my roses.

I did not think that it would survive in my new garden despite seeing plants my first year in the local nursery. Next year, no plants at the nursery so I bought seeds two years ago. I am terrible with seeds and manated to grow only two plants from a packet. This plant is the only survivor but is looking quite happy. There are even some seedlings growing at the base which I keep forgetting to pot up and transplant.
It's a lovely plant.
My problem is knowing what to do with it. Art and design have very little to do with my garden style. I have a plant. I find a hole and plant it. If it looks good, then I have an unexpected benefit. Right now it is overwhelming my 'Ceclie Brunner' rose since despite being a 'see through' plant, it's got some hefty branches. I won't move it because I know it would die but I need to find some places for it's babies where they will complement other plants. My first thought is to plant them in my summer hyacinth (galtonia candicans) bed. Since I have never grown it (galtonia, not verbenia) before and have no idea what it will look like when it grows up except it will be four feet tall this is a lame idea. Heck, it's the only idea I have so here we go. You see my problem.