Brugmansia Seedlings Dying: Prevent Damping-Off with Sphagnum Moss and Air Flow

Your Brugmansia seedlings reached 3″ then died. Kept moist, not wet, under lights, used dilute houseplant fertilizer. Suspect over-fertilizing.

Likely Cause: Damping-Off

Fungal disease killing seedlings at soil line.

Prevention

1. Top-dress with ⅛″ milled sphagnum moss after sowing—suppresses damping-off fungus.
2. Run a small oscillating fan on low to keep air moving.
3. Don’t fertilize until plants are 6–8″ tall; use half-strength if earlier.