
Black Spots on Peony Leaves
Why are the leaves on my peony turning black?
Botrytis and phyphthora blights can cause purple-black spots on the stems and leaves of peonies. Sanitation is often enough to keep this disease in check. Remove and dispose of infested plant debris in the fall. Add a 2 inch layer of mulch over the soil surface to keep soil borne fungi away from the plant. Use chemicals as a last resort in cases where sanitation has not worked and the disease has been an on-going problem. Apply a fungicide, such as copper, labeled for controlling this disease on peonies. Spray plants as the tips emerge and every 14 days through mid-June.
Related
Upcoming Live Events
& Webinars
June 1, 2025
Growing, Harvesting & Preserving Favorite Italian Herbs Demos
Festa Italiana-Cucina Showcase
Milwaukee, WI
June 4, 2025
FREE WEBINAR:
Attracting Hummingbirds
Register here
June 8, 2025
Selecting the Right Hydrangea
for Your Landscape
Ebert's Greenhouse Village
Ixonia, WI
June 14, 2025
Houseplants 101
Ebert's Greenhouse Village
Ixonia, WI
June 20, 2025 (event 6/20-6/22)
Pollinator Celebration
Vino in the Valley
Maiden Rock, WI
Register here
WATCH ON-DEMAND WEBINARS
Learn More