I have three 5' - 6' tree peonies, lutea var. ludlowii. They were in pots for about 4 years, then have been in the ground for 4 years. One flowered (magnificent!) for the first time this year. All are in full sun.

The 2 that haven't flowered are monsters of foliage, and are smothering everything under and around them and outgrowing their spaces as if they were on steroids. I have 2 choices - to move them in the fall, or to prune them. I realize moving them has its risks, and I've read about how to do it. But I can't find much info about pruning them hard, back to just a few stems. Is it possible to do that without killing them? Would it be better to have a go at moving them?

I'm in the Pacific Northwest, with lots of rain in the winter and lately long stretches of hot dry summer days.

Many thanks in advance for your suggestions!

Sharlene