Derryl Killan expounded:

Manure is a source of deadly plant diseases for bulbs and peonies.
Use lots of peatmoss if you need organic matter.

My great grandmother, gardening in southern Michigan, put well-rotted
manure on *everything*, she had the most beautiful peonies I've ever
seen. I'm fortunate enough to have a plant from her garden. It loves
manure, although I keep it away from the stems.

--
Ann, Gardening in zone 6a
Just south of Boston, MA
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