It's been a month and peony buds still haven't opened
I am new to peonies and have recently purchased a house that has many peony plants in the backyard. It seems that several of the plants have had buds on them for over a month that still haven't opened. Is this normal? I think they are herbaceous peonies (they're not fern and not tree, anyway) and the tiny bit of petals that I can see are a deep red.
They are not in full sun and we have had some cold weather, but before the cold weather came in we had some unseasonably balmy weather, in the high 60s and low 70s. They are planted with many other plants but I don't think they're receiving any shade from them. I have a tree peony and another type of herbaceous peony that have both been blooming, but these red ones won't budge. What's the deal?