Pruning Common peony

Paeonia officinalis requires minimal pruning, but a few seasonal tasks keep the plant healthy and tidy. In June, once the spectacular late-spring flowers have faded, deadhead spent blooms by cutting back to the first strong leaf below the flower. This prevents the plant wasting energy on seed production and keeps the foliage looking fresh through summer. Do not cut back the stems and leaves at this stage—the foliage is essential for photosynthesis and building up the roots for next year's display. The main pruning window is in late autumn, from October through November, after the first frosts have blackened the foliage. Cut all stems down to ground level using clean, sharp secateurs. Remove and dispose of all top growth, especially if you've noticed any signs of peony wilt (botrytis) during the season—this fungal disease overwinters on dead plant material, so good hygiene is critical. Burn or bin the debris rather than composting it. If your plant has remained disease-free, composting is fine. Avoid any temptation to tidy up earlier in autumn while the leaves are still green or only partially yellowed; the plant is still drawing nutrients back into the crown and roots. Similarly, resist cutting back flowering stems in summer for the vase unless absolutely necessary—removing too much foliage weakens the plant. Peonies do not require formative pruning or reshaping. If an old clump becomes congested or flowering declines after many years, lift and divide it in early autumn rather than pruning it back harder.