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light or heat source damage

What you’re seeing

Localized scorch, dry patches, or faded leaves closest to a lamp, radiator, fireplace, or other heat source. Soil may dry unevenly on the heated side.

What it is

Damage from proximity to an artificial light or heat device—intensity, or hot air flow exceeding what the foliage can handle.

Is action needed?

Yes—reposition and manage intensity.

How to confirm

  • Distance test: Injury is worst on the side nearest the device; moving the plant 15–60 cm (6–24 in) away halts progression.
  • Device profile: High-output LEDs without diffusers, halide lamps, or strong heaters are common culprits.

What to do

  1. Increase distance from the device; add diffusers/reflectors for lights.
  2. Reduce photoperiod to 10–12 hours under strong fixtures.
  3. Redirect hot airflow away from foliage.
  4. Hydrate appropriately; warmer zones dry faster.
  5. Trim only dead tissue once new growth resumes.

Prevention tips

  • Follow manufacturer’s recommended plant-to-light distance.
  • Use fans for gentle air mixing—not directly blasting plants.
  • Check foliage temperature by touch; if it’s hot to your hand, it’s too hot for leaves.
  • Sunscald from window sun shows on the glass-facing side after a bright day.
  • Light excess without heat yields paler, not crispy, leaves.

Images

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