Why my compost has white mold, should I worry it?

Vivian·a year ago

When adding organic material to soil near plants, GEME users and others may discover white mold. This topic is interesting because some people find it exciting and consider it a good sign of soil health, while others believe it can harm plant growth. Today, we will discuss this issue by examining each case separately.

The mystery of white mold on compost pile

Why does the soil in my pot look moldy after adding compost? The soil in your pot may appear moldy due to actual mold growth. This could be caused by the presence of mold spores in the compost you added, which may have thrived in damp or humid conditions.

Possible reasons that cause white mold

Actual mold growth

It's possible that the compost you added to the pot contained mold spores that have now started to grow in the soil. This can happen if it was stored in damp or humid conditions.

Fungal activity

Compost is rich in organic matter, which can promote the growth of beneficial fungi in the soil. Some types of fungi can have a white, web-like appearance that may look similar to mold.

Nutrient availability

Adding compost to soil can alter its nutrient levels and pH, thereby influencing microbial activity and promoting the growth of fungi and other microorganisms.

Watering habits

Overwatering can create a damp environment that promotes the growth of mold and fungi in the soil.


It's important to identify the cause of the issue before taking any action.

If it is actual mold growth, you may need to remove the affected soil and replace it with fresh soil. If it is fungal activity, you may not need to do anything as this can be beneficial for your plants. If it is related to nutrient availability or watering habits, you may need to adjust your soil and watering practices accordingly.