Grower Guide
Cannabis plant symptoms: record the sign, then compare the evidence
A visible sign is the start of an investigation, not the name of a cause. Record where it appears, the confirmed plant stage, and what changed nearby. Then compare environment, watering, feeding, and lighting history before deciding what deserves a controlled follow-up.
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Swipe horizontally, or focus this table and use the arrow keys, to compare all four evidence columns.
| Visible pattern | Evidence to compare | What to log next | What not to assume |
|---|---|---|---|
| Yellowing / discoloration | Pattern and leaf age, Root-zone history, Recent feeding, Environment | Location, stage, progression, repeatable photos, and the next 24–72 hour response. | Yellowing alone does not prove a nutrient deficiency. |
| Spots / lesions | Distribution, Leaf surfaces, Watering and feeding, Environment | Distribution, both leaf surfaces, progression, repeatable photos, and scouting observations. | Spots alone do not identify a pest, pathogen, or deficiency. |
| Burnt, crispy, or damaged tips | Affected position, Feed history, Root-zone history, Light and heat | Affected canopy position, progression, repeatable photos, and any measured input or room change. | Crispy tips alone do not prove nutrient burn or excess light. |
Start with what is visible
Use plain observations: yellowing, discrete spots or lesions, or dry tips and edges. Add location, timing, progression, and whether new growth differs from older growth. Avoid naming a deficiency, pest, pathogen, or burn until the surrounding evidence supports that comparison.
Compare the prior 14 days
Look back across the same plant for watering and feeding, and the same plant or tent for environment and explicit lighting context. Missing history is not proof that nothing happened. A partial timeline stays labeled limited so a grower can fill the gap without false certainty.
Make one controlled follow-up
Avoid changing feeding, watering, lighting, and airflow at the same time. Preserve a baseline, change one justified variable, and record the response.
Common questions
Keep reading
- Cannabis leaves turning yellow: compare the pattern before calling the cause
- Cannabis leaf spots and lesions: preserve distribution, surfaces, and timing
- Burnt or crispy cannabis leaf tips: compare feed, roots, light, and heat
- Cannabis plant care FAQ: practical answers with the context to use them safely
- How to decide whether a grow-room sensor reading is trustworthy
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