Black Spots on Orchid Flowers: Botrytis from Evening Watering

Grower-Caused Botrytis

Black spots on new blooms = water on buds overnight. Spores germinate in cool, damp darkness. Commercial greenhouses with overhead irrigation commonly show this.

Remediation

• Gently rub with Listerine-soaked Q-tip (surface mold only).
• If penetrated, remove affected flowers.
• Future: water morning only; air movement.

Prognosis

Plant is fine. Unopened buds likely clean. Cultural fix prevents recurrence.