Managing Mushroom Fungi in Potted Plant Soil

After moving a large split-leaf philodendron outdoors into dappled shade, the soil surface is covered with small whitish mushrooms. You want to know if you can treat the soil or need to repot.

What You’re Seeing

The mushrooms are just the reproductive structures; the fungal mycelium is throughout the soil. It’s usually harmless to the plant but unsightly.

Control Measures

1. Purchase a fungicide labeled for soil drench at a garden center; apply per label for 3–4 months.
2. Rake the soil surface frequently and remove mushrooms as soon as they appear to prevent spore release.
3. If the problem persists, cover the soil with inorganic mulch (pea gravel) to suppress visible fruiting bodies.

Repotting with fresh potting mix is an option but may not eliminate the fungus entirely if spores are airborne.