peony, faded

When I visited Long Hill just over a week ago the peonies were in full bloom. Today, most had faded.

It seemed odd (to me) that the peonies at the close-to-me garden haven't bloomed yet while those at Long Hill are past their prime. I think the peonies at Long Hill are tree peonies and those that live at Stevens-Coolidge Place are herbaceous peonies. Based on the information I've been able to find the two species bloom at different times.