White Fungus on Pine Stump Spreading to Siding: Safe Cleanup

Question: After removing a large pine, a whitish, mossy growth has engulfed the 33-inch stump and is creeping up the house siding. Automatic watering of a nearby rose pot may be feeding it. Is this dangerous? Should I use bleach?

Answer

The growth is likely a saprophytic fungus decomposing the dead stump—harmless to living plants but unsightly on siding.

Cleaning the Siding

1. Rinse the area with plain water.
2. Mix a gentle detergent (RV/boat wash or mild dish soap) with warm water to a frothy consistency.
3. Apply with a soft brush on a pole (RV brushes work great) from bottom to top, working in shade.
4. Rinse each section immediately—never let soap dry on vinyl.

Why Not Bleach?

Chlorine bleach kills surrounding vegetation and can leach into soil, damaging roots. Stick to soap and mechanical cleaning.

Stump Management

The fungus will naturally disappear as the stump decays. If you want it gone faster, consider stump grinding or a commercial stump remover.