My friend has a lot of huge peonies that she would like to share with others. She is uncertain as to when she should do this, and how. Any suggestions would be appreciated!
The best time is in the fall according to most Peony experts.
Use a sharp knife sterilized with heat or alcohol. Dig up the roots in fall and cut them making sure to have 3-5 eyes on each root. Eye is basically the pink nub. . .the same as a potato.
A big spade right through the middle :) Seriously, stick a spade through the middle and dig up one half. Chances of losing it are quite small, maybe get fancy if you have one you simply couldn't replace.
Remember to let the cut dry before planting. If the soil is damp can wet newly cut peonies will provide a wonderful feast for bacteria and fungi.