Are these spots harmful to the puffball?

Most surface spots are cosmetic, but mold can eventually damage the tissue. It is best to address them early.

Should I use tap water?

Filtered or distilled water is better to avoid mineral buildup. Tap water can leave spots on the surface.

Why are there spots on my Pear-shaped puffball?

Check these first

Examine the spots to see if they are fuzzy or crusty.
Check if the spots are spreading over time.
Inspect the surrounding wood for signs of mold.

Likely causes

Surface Mold
Most likely
How to tell: Fuzzy or discolored patches appear on the surface of the puffball. These spots may spread if left alone.
What to do: Gently wipe the area with a clean, damp cloth. Improve airflow around the puffball to prevent mold growth.
Mineral Deposits
Possible
How to tell: White or crusty spots appear after misting with tap water. These spots do not spread like mold.
What to do: Switch to using distilled or filtered water for misting. Gently brush off existing deposits with a soft brush.

When to worry

If the spots are accompanied by a foul smell or rapid softening, the puffball is likely rotting. Small, non-spreading spots are usually harmless.

Stopping it coming back

Use clean water and ensure good air circulation around the wood substrate.

Not sure which one it is? Photograph your pear-shaped puffball.

This page lists the usual causes. Pocket Botanist looks at your actual leaf and tells you the likely cause, how serious it is, and what to try first. Identification and a health check are free.

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Questions people ask

Are these spots harmful to the puffball?: Most surface spots are cosmetic, but mold can eventually damage the tissue. It is best to address them early.
Should I use tap water?: Filtered or distilled water is better to avoid mineral buildup. Tap water can leave spots on the surface.