Florli

Plant problems

Mold on potting soil

A thin surface growth differs from rot affecting roots, stems or the crown.

Wet surface

Frequent small top-ups keep the upper mix damp.

Organic debris

Dead leaves provide material for saprophytic fungi.

Low airflow

Still cool conditions slow surface drying.

Problem

What to do next

  1. 1

    Remove fallen debris and the loose affected surface layer.

  2. 2

    Improve airflow and allow appropriate drying for the plant.

  3. 3

    Inspect roots only if the plant is declining or the mix smells sour.

Observation

When to act sooner

  • The stem base is soft or moldy.
  • The plant wilts in wet soil.
  • Fungal growth returns with a strong unpleasant smell.
Important

Mold on potting soil can have several causes. Confirm the plant, conditions and recent care before choosing a treatment.

Florli

Related guides and features

Library Plant problems Yellow leaves, brown spots and root problems: learn what to inspect first and how to avoid making the situation worse. Read the guide → Feature Plant problem checker Florli helps you organize symptoms, consider possible causes and choose a cautious next step without presenting an uncertain result as a definite diagnosis. Read the guide → Feature Plant and garden journal Record watering, feeding, mowing, planting, pruning and your own notes in a history attached to the right plant or place. Read the guide →
Sources and further reading: University of Illinois Extension: houseplant care

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Prepared by Florli. This is general guidance. Sources are listed with each guide, and every decision should reflect the species, location, weather and the plant’s current condition.