Syngonium Soil Mold: Harmless Fungus, Scrape It

White fluffy mold on soil of thriving syngonium = harmless saprophytic fungus from potting mix spores. Not spider mites (no webbing on leaves).

Management

1. Scrape off mold + loose soil.
2. Repeat as reappears—usually clears.
3. If persistent, soil fungicide per label.

Why It Happened

Spores in new mix activated by moisture. Your care (sterile mix, east window, careful watering) is excellent.