Begonia Mold Infestation: Overwatering + Heavy Soil = Lysol & Perlite

Circular mold spots on begonia leaves/stems = overwatering in dense soil. Fix: dry out, Lysol spray, improve soil aeration.

Immediate Treatment

• Drain excess: remove saucer, let sit in sink overnight.
• Spray affected areas with aerosol Lysol (hold 6+ inches away). Repeat weekly until resolved.
• Thin dense growth for air flow.
• Move to sunniest spot—mold hates sun.

Soil Fix for Next Repot

Mix 2 parts potting soil + 1 part perlite. Lighter soil, better drainage, less overwatering risk.

Why It Happens

• Peat-heavy soil holds water too long.
• Winter short days = less water use.
• Weekly watering = constant wet = mold + root rot.

Lighten the soil, cut the water, add sun. Begonia recovers fast.