Karen, my petunias are also going the way of the compost pile... the hot temps we had even here in N. Michigan, lack of rain, and the fact that my flower boxes are on the railing on the south side of my deck (plus not enough attention from me) combined to cause their early demise. Next year (actually, I say this every year but this year I really mean it, LOL) I'm going to plan to have some plants started that I can exchange for the petunias once they get scraggly.
I think i put too much energy into my veg garden and not enough into the flowers, but the veggies are growing like crazy at least!
Sandy