My flowers flop
My perennial garden is lovely, but I wonder why so many flowers flop. Right now, the gloriosa daisies are flopped, as are the coreopsis. The Painted Daisies are finished now, but they flopped. The Obedient Plant is tied up to keep it from flopping. Peonies, lilies, short plants seem to be ok.
The bed is more shaded than it used to be, and it gets irrigated from the auto system but there are places that are quite dry.
What do you think is the main culprit? Shade, water or thin soil? I appreciate your insight.