Blackened flowers often mean insect damage (thrips, slugs, or mites). Inspect plant and root ball. Treat with appropriate insecticide. Healthy peace lilies don't bruise spontaneously.
Saving a Peace Lily from Systemic Fungal/Bacterial Infection
Rubber Plant and Peace Lily Troubles in Low Light
First Peace Lily: Watering, Fertilizing, and Smoke Myth
Peace Lily Toxicity to Cats: Irritation, Not Usually Fatal
Reviving a Heat-Stressed Peace Lily: Watering, Pruning, and Recovery
Peace Lily (Spathiphyllum) Reblooming: Watering by Weight and Fertilizing
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