Nutrient burn
too much feeding
How to tell
Brown, crispy spots concentrated at leaf tips and edges, often on the newest growth
Fix
Flush with plain water and reduce nutrient concentration on the next feeding
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Find the likely cause
Brown spots
- Brown spotsSymptom chosen
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Question 2 of 4
Where are the brown spots concentrated?
Question 3 of 4
Have you recently increased feeding strength or frequency?
Question 4 of 4
What's the humidity and airflow like where it's growing?
Most likely cause
A best guess from your answers, not a definitive diagnosis. If it doesn't match what you're seeing, compare all causes.
Calcium or magnesium deficiency
How to tell
Spots scattered across the leaf surface rather than just the edges, sometimes with a rust-colored tint
Fix
A cal-mag supplement is the standard fix, especially common in soilless or coco-based grows
Leaf septoria or other fungal spotting
How to tell
Circular spots with defined edges, often starting on lower/older leaves in humid conditions
Fix
Improve airflow and reduce humidity; remove affected leaves so it doesn't spread
Your answers didn't point clearly to one cause.Compare all the possible causesto find the closest match.
Other things it could be
- Nutrient burnBrown, crispy spots concentrated at leaf tips and edges, often on the newest growth
- Calcium or magnesium deficiencySpots scattered across the leaf surface rather than just the edges, sometimes with a rust-colored tint
- Leaf septoria or other fungal spottingCircular spots with defined edges, often starting on lower/older leaves in humid conditions
Rather read everything? See all causes for brown spots →