I had a few plants last yr, towards the back of this end of the bed. I wasnt sure I liked them. I even pulled a few out last yr. But this yr a bunch sprouted up in shades of purple and white, and look so nice near the purple iris's and the bright pink azalea. My huge weigela just to the right of the azalea, and looks just as beautiful. I think I will let them stay.
PS: I edited the title as I at first thought these were phlox and later found out they are really Dames Rocket.