Getting Rid of Fungus Gnats in an Office Asparagus Fern

Tiny black gnats flew around an asparagus fern in a terra cotta pot on an office shelf.

Cause & Cure

• Overwatering → root rot → fungus gnats.
• Water once with rubbing alcohol (same volume as normal watering).
• Empty tray after 30 minutes; then keep soil much drier.
• No further spray needed; alcohol makes soil uninhabitable for gnats.

Overwatering kills more plants than underwatering.