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White Mold on Repotted Plant Soil: Harmless Saprophytic Fungus

Cause

Spores in new potting soil + moisture = surface mold. Harmless to plant.

Removal Options

Scrape off mold + loose soil. Repeat as needed. Let soil dry more.
Fungicide soil drench (follow label).
Replace all soil with sterilized soilless mix.

Prevention

Use sterile mixes. Water less frequently. Increase air flow.

House Plants: Mold on Potting Soil: Causes and Solutions; Fungus Gnats on Indoor Impatiens: Cultural Control; Gray Mold on Potting Soil: Harmless or Harmful?; Houseplant Soil Mold: Improve Drainage, Air, and Consider Repotting; Persistent White Mold on Houseplant Soil: Control, Not Cure; Mold or Mineral Deposits? Saving a Greenhouse Bog Garden; White Mold on Soil After Repotting Croton and Ficus Bonsai; Dealing with Mold on Houseplant Soil: Causes and Simple Solutions; Deep Soil Mold in 43 Plants: Drainage, Lysol, Skewer Method; Managing Mold on Houseplant Soil

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