Answer: I suspect the crazy oscillating spring temperatures damaged the flower buds, hence no blooms. The white sounds like mildew. This will not kill the plants although it looks unattractive. Mildew can occur under certain weather conditions. Good air circulation along with watering in the morning and avoiding wetting the foliage if you water, can help prevent it. If it is just a few leaves you can remove them now to try to stop the spread. At the end of the season after frost kills the foliage, rake up the fallen peony leaves and stems and dispose of them in the trash. Let's hope for a better season next year!
Q&A Library Searching Tips