Soilsandup: I have been meaning to check with you to see if the rose root which I sent to you survived and grew. Good that it is doing well. It will put out suckers and spread into a nice bush or climb to about 8 feet tall if supported on a trellis.
As far as an age to divide peonies, it is a matter of personal preference. I do it on an impulse method, rather than scientific issues. A mature clump can become 4 or 5 nice divisions in cases of a really nice peony to be donated to friends or just to begin a new location.
