This spring I bought 4 Bowl of Beauty roots and potted them up. Three of the plants look normal. The fouth has leaves that "fold up" a bit along the center vein and the leaves are slightly deformed or "crinkled" - just a little. The leaves are completely green, no black or brown spots. I was wondering if this is something that is a disease? Don't know much about peonies. Thanks in advance for any advice!!