Generally the less sun the less bloom and the weaker stems. With the large double bloom the rain takes its toll. With only three plants you could shake off the water after a rain. The sun at bloom time should not cause a problem. An established peony in good soil with plenty of water should never wilt. Al

Al, I never see the plant itself wilting in the sun, just the blossoms. They seem to "over bloom" quickly and the petals just fall off. I see peonies in the neighborhood planted in shaded areas. Maybe they are a different variety. I think I'll transplant one to an east facing location and give it a try. Thanks for your help.

Unfortunately peony blooms do not last long after they are fully open. Good luck with your experiment, let us know how well it works. Al

Kathieo, my peonies have been growing in the dappled shade of tall, limbed-up oak trees for years. They bloom reliably, but lightly. Unfortunately, we have found that the peak of the peony bloom cycle invariably brings heavy rains, with results you are already familiar with. I have been known sink the shaft of a lightweight umbrella into the soil nearby to provide protection when rain is in the forecast ... Looks ridiculous, but it does work!

Actually, I've found many plants are happy with good morning sun and a bit of afternoon shade.

We've just had two large oaks removed, and my peonies will now be getting a good deal more sun, so we're both moving into new territory. I wish you luck with your experiment!

I have 3 large old peonies that have been in the same spot for over 15 years. The area has become very shady and the peonies no longer bloom, although the plants are huge and healthy. I was planning to transplant them to a sunnier location also and was hoping for an answer to "when" is the best time to transplant...

NOW, Fall is best for transplanting and dividing.