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Light burn vs heat stress — how to tell the difference?
Top leaves are yellowing/bleaching but the plant isn't wilting or drooping. Tent temp is 78°F which seems fine. Light is a 300W LED at 12 inches. Is this light burn or something else?
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4 Comments
Experienced2mo ago
Looks like a classic case. Check your pH first — 90% of these issues trace back to pH being off. Even small deviations can lock out nutrients.
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Grower2mo ago
Had this exact issue last grow. What fixed it for me was flushing with pH'd water and letting the soil dry out before feeding again at half strength.
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Experienced1mo ago
Post a picture if you can — hard to diagnose without seeing the actual damage pattern. But from your description, I'd guess pH-related lockout.
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Experienced1mo ago
Environment is key here. What's your temp and humidity? Sometimes the symptom looks like a nutrient issue but it's actually environmental.
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