If you are wanting to do by color and do not know the names, then get yarn in many colors (go to garage sales) and put the red on reddish ones, pink on pink, white on white.
Hope this helps as this is what we did for a friend, she never saved names and now they need to be replanted so at bloom last year we marked them with the yard and she was able with help to get them in a pleasing palette for her taste
D