Hey Guys! My soil keeps developing saprophytic fungi (in a white ball form). I have it in a few plants and have treated with hydrogen peroxide but it’s not going away. I use a chunky aroid mix and moss poles(and I’m usually an under-water) im not sure why it keeps coming back. They are all happy and healthy, but I’d appreciate any tips or tricks would be very helpful!! Thank you all!!

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Also called saprotrophic fungi, the "sapro" in saprophytic means "debris" or "rotten materials", the "trophic" means "nourishment". They get their nutrients from decaying/rotting material. They pose no threat to healthy plants, and indeed are generally considered beneficial since they free up nutrients for plants to use.

Your potting mix is a bunch of wet organic material, and it's decaying like anything else: with whatever microorganisms happen to be there that can grow on the substrate.

It's extremely difficult to get rid of one of those organisms if the substrate is a hospitable environment for it. You would need to kill the organism, all of its spores, and prevent any new spores from blowing in. Otherwise, it'll eventually come back. Totally sterilizing the potting mix without killing the plant is tough, plant roots are a lot less hardy than fungal spores.

If you absolutely can't live with the fungus and you are certain you can't reduce water any more without harming the plant, your best bet is to switch potting mix in the hopes of finding something that fungus doesn't like. Any old potting mix attached to the roots will still support the fungus but you might be able to find a mix that it won't spread into.

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There's nothing wrong with that. That's a mycorrhizal fungus that communicates nutrients to the plant. You can leave it alone

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