I may have over watered or something has happened. It started with a few petels browning on each head. Now every head looks terrible. More and more flower petals are browning. I have these two plants in 2 very large planters.

I planted them in the moisture control miracle grow soil.

Mulched around each one after planting.I have kept them moist.(maybe too moist) Does anyone have any ideals on how to turn these loved plants around? Should I clip off the browing heads?