Question
I have an indoor plant similar looking to a palm tree but on top of the soil there are tiny white mushrooms popping up. why is this and what is it from.

Answer
Hi Delaine,

Mushrooms or soil mold comes from fungus spores in the soil. They thrive in cool, damp conditions. They are not harmful to plants. Fungal molds usually only occur if you do one or more of the following:

稶se Unsterilized potting soil, garden soil or compost;
稶se a soil mix that is compact and doesn't drain well;
稟dd food substances to the soil, such as soda or coffee;
稫eep your plants constantly wet and/or in low light.

The use of a peat-based, soilless potting mix usually prevents the problem. If you repotted your plant, then there is a very good chance that the soil that you used is contaminated with fungus spores. You may not want to use it again.

First, try scraping off excess loose soil and the mold from the surface of the rootball. You may notice some whitish substance just below the surface of the soil. This is the equivalent of fungi roots and is called mycelia. Try to scrape as much of this out as possible. The application of a light spray of diluted alcohol sometimes helps. Then let the soil dry out as much as possible without damaging the plant. It is usually necessary to repeat this process each time you see new mushrooms pop up. With persistence, you will eventually get it under control. A warmer, sunnier location will also help deter the mold. In extreme cases, a systemic fungicide can be applied as a soil drench.

Please let me know if any of this is unclear or if you have any additional questions.

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Regards,
Will Creed, Interior Landscaper
Horticultural Help, NYC

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