It looks like a daylily.

I have no personal experience of this but could it be Zephyranthes Candida, commonly called the rainflower because it blooms after rainfall? Have a look on here: http://www.pacificbulbsociety.org/pbswiki/index.php/Zephyranthes Whatever, it is very pretty.

My Allium Moly looks like this. Just bloomed and I'm in zone 4/5. The first blooms are going to seed. Very pretty, dainty flowers. So many of my other flowers aren't ready to bloom and this one looks so nice.

Front row Pink Impatiens. I can't see the blue ones in between clearly enough to id. Second row Blue Conoclinium coelestinum or Ageratum, Pink Antirrhinum and a Pink Rose. Against the fence Cleome and Antirrhinums. Beyond the fence assorted Astilbes and Echinacea. No Petunias as far as I can see. Call me an old cynic but you need to be aware that this picture has been manipulated to enhance the colours and the whole ensemble is a bit of a fantasy for the realistic gardener. What will it look like in a month's time? And what did it look like a month before?