2011 Peony Experiments - Intersectional Blooms

I think I read somewhere that intersectional peonies would not bloom on old wood, and that the old stems must be cut down every year in order to get blooms. Somehow this did not ring true to me, and I wanted to find out for myself. So for the last 2 years I have left some of the old wood on my intersectional peony 'Bartzella'. The first year I didn't get any blooms on the old wood, but this year I did. Considering that intersectional peonies are merely a cross between herbaceous and tree peonies, and tree peonies bloom on woody stems, it makes sense that intersectional peonies could bloom on their woody stems as well. Perhaps the climate the intersectional peony is growing in will make a difference. I could see how the woody stems of the intersectional peony may not be as cold hardy as the woody stems of the traditional tree peonies. However for my zone 7 southern climate, intersectional peonies can definitely bloom on their woody stems from the previous year.
Peony 'Bartzella'

Peony 'Bartzella'