Use the plant type to choose the season
Dividing an established herbaceous peony
Fall is the usual planning seasonIllinois Extension names fall as its best time to divide and replant.
A new bare-root plant
Follow its plant label and local conditionsIowa Extension advises planting bare-root perennials before spring growth when no other instructions are supplied.
A container-grown peony
Set it at its existing depthIts root ball is already positioned differently from a bare-root crown.
Do not turn a regional fall rule into a national deadline
Fall is a useful division season in the cited Midwest guidance, but the workable planting window depends on local soil, winter and stock type. Use a local Extension source if Garden Tempo does not yet cover your state.
Start with a site that drains
Peonies flower best in full sun and well-drained soil. Penn State and Iowa State both caution against wet conditions; choose the bed before choosing a calendar date.
Keep herbaceous peony eyes shallow
For a bare-root herbaceous peony or a division, set the buds or eyes facing up and cover them with only 1–2 inches of soil. Penn State, Iowa State and Illinois Extension all give this shallow range. A tree peony follows a different planting-depth rule, so keep the plant label with the root.
Use this quick planting plan
Bare-root herbaceous peony
Locate the eyes, then measure depthPlanting too deep can delay or prevent flowering.
Container-grown peony
Keep the root ball at its original levelWater it well through its first establishment period.
Existing clump
Divide only when you can identify healthy eyesA division needs both buds and a portion of the root system.
Quick questions
Why is my new peony not flowering?
Check depth and establishment time firstShallow eyes matter, and newly planted peonies may need time to settle in.
Can I use the same depth for every peony?
NoThe 1–2-inch eye rule here is for herbaceous bare-root plants and divisions; tree peonies use a different method.