Yes, too late for paeonies sadly we had the last of the English ones last week though the dutch ones are still about they normally finish in July, we suggest large headed roses and hydrangea for the later summer brides wanting that look, Illusion or Sweet Avalanche roses, I looove the antiquey look of them, with poppy seed heads and firework grass and sedum, lovely faded textures. Probably not at all what you are thinking lol.... we use jasmine plants for more elegant trails than ivy. Stephanotis plants are nice too, unravelled off their frames and trailing, got a bit of weight about them and move nicely when you flounce down the aisle lol.