Post-Repot Leaf Loss in Orchids: Fungus Risk from Evening Watering

Sudden Leaf Loss After Repot = Red Flag

Losing one bottom leaf before repot = maybe normal. Losing another quickly after = problem. New leaf emerging is good, but doesn't cancel the warning.

Prime Suspect: Evening Watering + Fungus

Watering late day → water in leaf crowns/axils overnight → Botrytis/crown rot → leaves detach at base. Check leaf bases for black sooty areas = fungal signature.

Immediate Fixes

1. Water ONLY in morning—leaves dry before night.
2. Add gentle air movement (small fan, not direct blast).
3. Inspect crown/leaf bases for rot; dust with cinnamon if suspicious.
4. Ensure medium drains well—not soggy.

If Fungus Is Confirmed

• Unpot, rinse roots, trim all mushy tissue.
• Repot in fresh mix; consider systemic fungicide drench.
• High humidity tent to support remaining foliage during root recovery.

Prevention Is Everything

Morning watering + air flow + annual fresh mix = 90% of disease prevention. The new leaf is hope—protect it with perfect culture.