Well....I tried this the year before last. I didn't have much luck with the moving them outside for the day to harden part. as I would get home late and it would be cold and all. So The next year I tried starting the seeds indoors and then transplanting them to containers. So basically I had a bunch of pots with flowers in them that I would place on my deck and around the plant beds of my normal perennials. Such as my Hosta, evergreens and azaleas, etc. I had much better luck, doing it that way. Just a thought.