Herbaceous peonies usually need their dead stems and foliage removed after they die back in autumn. Tree peonies keep a woody framework and must not be cut to the ground as an annual routine. Identify your peony before pruning: treating those two types alike can remove valuable growth.
Herbaceous peonies: retain green leaves after flowering
Remove faded flower heads if desired, but keep healthy foliage through the growing season. The leaves continue supporting the plant after the flowers finish. Cutting the whole plant back immediately after bloom does not reliably produce another crop of flowers or guarantee larger blooms next year.
Once the foliage dies back, cut dead growth close to ground level without injuring the crown or emerging buds. Collect the debris, especially where disease has been a problem. The RHS herbaceous and intersectional peony guide explains seasonal care and the importance of distinguishing peony types.
Intersectional, or Itoh, peonies
These hybrids also have seasonal dieback, but short woody bases and visible buds can affect where you cut. Follow guidance for the cultivar and preserve viable basal buds rather than forcing every stem to one fixed height. If you are unsure of its identity, retain the label or ask the nursery before making a hard cut.
Tree peonies: preserve the woody stems
Do not apply herbaceous-peony cleanup instructions to a tree peony. Its woody structure remains from year to year. Routine care is usually limited to removing clearly dead or damaged growth and any necessary selective pruning at the appropriate time. Major renovation needs plant-specific advice.
A stem that looks bare during dormancy is not automatically dead. Check identification and signs of viable buds before cutting. A harsh winter does not mean that a tree peony should be pruned more aggressively for protection.
Disease cleanup and tools
Use sharp, clean tools and remove affected debris according to local plant-health guidance. If leaves develop spots or stems collapse during the growing season, identify the problem rather than removing all healthy foliage as a preventive treatment. Cleaning tools and improving growing conditions can help reduce spread, but pruning is not a guarantee against disease.
What if autumn cleanup was missed?
Remove dead herbaceous growth before new shoots make the task difficult, taking care not to cut the new growth. Keep the plant’s type and condition as the deciding factors. A container-grown peony follows the same basic distinction; limited root space is not a reason to repeatedly remove green leaves.
Poor flowering can involve planting depth, light, establishment or other stresses. Annual cutting is not a general fix for those problems. Preserve healthy leaves, clean up dead seasonal material and leave a tree peony’s living framework intact.
