Paeonia lactiflora · Perennial
Peony wilt (Botrytis paeoniae): Remove and burn infected material promptly to reduce spores, and ensure good air circulation around plants.
Slugs and snails: Use physical barriers like copper tape or apply iron phosphate-based pellets around the base of plants.
Powdery mildew: Improve air circulation, avoid overhead watering, and apply a suitable fungicide if infection is severe.
Root rot: Ensure well-drained soil and avoid planting too deeply; lift and divide congested clumps in autumn.
Ants on buds: Leave them alone as they are generally harmless and may help deter aphids; remove only if aesthetically undesirable.