White Mold on Potting Soil: What It Is and How to Get Rid of It

You’re watering your plants, and suddenly you notice a layer of white, fuzzy material growing on the surface of the soil. Don’t panic—white mold in soil is common and often harmless, but if left unchecked, it can affect plant health over time.

Here's what it really is, what causes it, and how to remove it effectively.

What Is That White Stuff?

That white growth isn’t usually mold in the dangerous sense—it’s a type of saprophytic fungus. It feeds on organic material in the soil and thrives in moist, low-airflow environments.

It’s most common in:

• Overwatered pots

• Poorly ventilated indoor spaces

• Soil mixes high in organic matter like peat or compost

Is It Dangerous?

Most of the time, it’s not harmful to the plant, especially if caught early. But it can indicate a deeper problem: poor drainage, low airflow, or too much moisture—which over time can stress the plant or invite root rot.

How to Get Rid of It

1. Scrape It Off
   Gently remove the top layer of affected soil with a spoon or fork. Replace it with fresh, dry soil.

2. Improve Air Circulation
   Move your plant to a better-ventilated area. Use a small fan indoors if needed.

3. Adjust Watering Habits
   Let the top inch of soil dry out before watering again. Avoid watering at night.

4. Add Natural Anti-Fungals
   Sprinkle a bit of cinnamon or activated charcoal on the soil surface—they’re both natural fungicides.

5. Sterilize the Pot (If Reusing)
   If the mold keeps returning, repot the plant in fresh soil and clean the container with a mild bleach solution.

How to Prevent White Mold in Soil

• Use well-draining soil mixes

• Don’t let water sit in saucers under pots

• Avoid overcrowding plants—airflow matters

• Water early in the day to allow the soil to dry.