How to Diagnose Cannabis Plant Problems
Cannabis plant problems fall into four main categories: nutrient deficiencies (yellowing leaves, brown spots, stunted growth), pest infestations (spider mites, aphids, thrips), diseases (powdery mildew, bud rot, root rot), and environmental stress (light burn, heat stress, overwatering). Early identification is critical — most issues are fixable if caught within the first few days. Upload a photo below for an instant AI-powered diagnosis, or browse the common problems chart to identify symptoms manually.
Common Cannabis Plant Problems
| Problem | Signs | Quick Fix |
|---|---|---|
| Nitrogen Deficiency | Lower leaves yellowing from bottom up, pale green overall | Increase nitrogen in feeding schedule, check pH (6.0–6.5 soil, 5.5–6.0 hydro) |
| Calcium Deficiency | Brown spots on leaves, curling edges, stunted new growth | Add Cal-Mag supplement, ensure pH above 6.0 in soil |
| Spider Mites | Tiny white/yellow dots on leaves, webbing underneath | Neem oil spray, increase humidity, introduce predatory mites |
| Powdery Mildew | White powdery coating on leaves, spreads quickly | Improve airflow, reduce humidity below 50%, apply potassium bicarbonate |
| Light Burn | Yellow/bleached tips closest to light, leaves curling up | Raise lights 6–12 inches, reduce intensity, check PPFD levels |
| Overwatering | Drooping leaves (heavy and limp), slow growth, possible root rot | Let soil dry between waterings, improve drainage, reduce watering frequency |
| pH Lockout | Multiple deficiency symptoms at once, despite feeding correctly | Flush with pH-adjusted water, recalibrate pH meter, target 6.0–6.5 for soil |
| Heat Stress | Leaves curling upward (taco-ing), edges browning, foxtailing in flower | Lower grow room temperature below 80°F, improve ventilation, add oscillating fans |
Frequently Asked Questions
How does the AI plant diagnosis tool work?
Upload a photo of your cannabis plant and our AI analyzes visible symptoms including leaf discoloration, spots, curling, wilting, pest damage, and mold. It cross-references these symptoms against a database of cannabis-specific problems to identify the most likely issues and provide targeted fixes.
Is this plant diagnosis tool free?
Yes, the AI plant diagnosis tool is completely free to use. Just enter your email to get access — no credit card required, no subscription, no limits on how many photos you can analyze.
What plant problems can the AI detect?
The tool can identify nutrient deficiencies (nitrogen, phosphorus, potassium, calcium, magnesium, iron), pest infestations (spider mites, aphids, thrips, whiteflies, fungus gnats), diseases (powdery mildew, bud rot, leaf septoria, fusarium), and environmental stress (light burn, heat stress, overwatering, pH lockout).
How accurate is the AI diagnosis?
The AI provides a confidence score for each diagnosis. It works best with clear, well-lit photos showing the affected leaves or areas. For best results, take close-up photos in natural light and include both affected and healthy parts of the plant for comparison.
Can I use this for plants other than cannabis?
The tool is specifically trained for cannabis plant problems, but many nutrient deficiencies and pest issues are common across plants. For best results with cannabis, include information about your growing medium, nutrients, and environment when analyzing your results.