Florli

Plant problems

Brown spots on leaves

Brown spots can follow sun scorch, cold damage, watering stress, infection or a product reaction. Their shape, speed and position matter.

Conditions

Strong sun, cold or contact with glass can create localized damage.

Moisture

Leaves that stay wet with poor airflow can support some plant diseases.

Roots

Waterlogging or prolonged drought may also show on the leaf blade.

Problem

What to do next

  1. 1

    Separate the plant if the change is spreading quickly.

  2. 2

    Take a close photo of both sides and record the date.

  3. 3

    Improve the conditions first; use a treatment only after confirming the need and label.

Observation

When to act sooner

  • Spots are wet, rapidly expanding or surrounded by yellow tissue.
  • New leaves and stems are affected.
  • Similar symptoms appear on nearby plants.
Important

Do not choose a treatment from the color alone. Inspect both sides of the leaf and note whether the spot is dry, wet, expanding or surrounded by yellow tissue.

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: watering houseplants University of Maryland Extension: spider mites on indoor plants

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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.