We have two peonies, planted by the previous owners of our house. This is our third spring in this house and one of them has never flowered. It doesn't get very tall, either. The other one was gorgeous the first spring, had fewer flowers last year, and this year has only one flower. I haven't done much to care for them, other than put composted manure around them as a top dressing. They are in a bed which runs along a stone wall and are closely surrounded by other plants: irises, phlox, daylilies, daffs, and tulips. The peony which has produced the flowers probably gets a bit more sun than the other one. I think this bed gets sun for about 6 hours a day. Is there anything I can do to help them bloom next year?