Susanne Holland Spicker     In the past when planning my beds, I always organized them  with a specific color or colors  in mind, with a  few  favorite  irises, then added an assortment of several perennial plants  that  coordinated with, or enhanced the bed.The past  several  years, however,  my passion for  tall bearded  irises has  increased and I have planted additional  irises that  coordinate  with  each other, adding several to the beds. The upside is  that this past season the beds were  a glorious array of  coordinating colors! The downside to adding more irises  is that division  must be done every 2-3 years in my beds  because of closer planting. I still have  companion plants  of every kind, but the number of irises now outnumber  the other perennials.       (l - r)  'PHOTOGENIC', 'ARISTOCRACY',   and  'SOUTHERN MORNIN...