I got these last year (sorry, can't remember where I found them, but there are lots of plant supports out there), and I put them, somewhat awkwardly, around my fully-grown peonies. It kind of worked.
But this year is the real triumph. I left them out in the winter, where they collected a delicate tracery of snow and looked lovely, also reminding me where the peonies were planted, so I didn't plant anything else there by mistake. And now, the peonies that I cut back last fall have grown back beautifully into the supports. Sometime in the next few days, I expect a glorious explosion.