Peonies with Blackening, Curling Leaves: Fungal Issue in Wet Conditions

A gardener near Vancouver, BC (Zone 9) has 12-year-old peonies that usually bloom well but this year show curled dark leaves and undeveloped buds on all six plants. She also asked if peonies dislike fertilizer.

Diagnosis and Management

Tom identified a fungal attack, often caused by overly moist conditions and poor sanitation. In fall, cut yellowing foliage slightly above ground and discard. Water at ground level, not overhead. The problem often self-corrects in drier years. If severe, remove dying plants and avoid replanting peonies there for 5 years. Fungicides may help. He linked to BC Master Gardeners for local advice.

Good hygiene and drainage are key to preventing peony fungal diseases.