Tool
Cannabis Plant Diagnosis Tool
Identify common problems with your cannabis plants using our visual diagnosis tool. Search by symptom or browse through categories to find solutions to pest infestations, nutrient deficiencies, diseases, and environmental stress issues.
Whiteflies
Pest Medium Severity
Symptoms:
- Tiny white flying insects under leaves
- Sticky honeydew residue on leaves
- Yellowing leaves
- Stunted growth
Solutions:
- Introduce natural predators like ladybugs
- Apply insecticidal soap or neem oil
- Use yellow sticky traps
- Increase air circulation
Spider Mites
Pest High Severity
Symptoms:
- Tiny speckling or spots on leaves
- Fine webbing between leaves and buds
- Yellow or bronzed leaves
- Tiny moving dots visible with magnification
Solutions:
- Introduce predatory mites
- Spray plants with insecticidal soap or neem oil
- Maintain higher humidity (mites prefer dry conditions)
- Isolate affected plants immediately
Aphids
Pest Medium Severity
Symptoms:
- Small pear-shaped insects on stems and leaves
- Sticky honeydew residue
- Curling, yellow, or distorted leaves
- Presence of ants (attracted to honeydew)
Solutions:
- Spray with water to dislodge aphids
- Apply insecticidal soap or neem oil
- Introduce ladybugs or lacewings
- Remove heavily infested leaves
Nitrogen Deficiency
Nutrient Medium Severity
Symptoms:
- Yellowing of older, lower leaves first
- Progressive yellowing moving upward
- Slower growth and smaller leaves
- Leaves may fall off prematurely
Solutions:
- Apply nitrogen-rich fertilizer
- Use organic options like blood meal or fish emulsion
- Ensure proper pH (6.0-7.0 for soil)
- Don't overwater as it can leach nitrogen
Phosphorus Deficiency
Nutrient Medium Severity
Symptoms:
- Dark green leaves with purple or red stems
- Leaves may develop purple or bronze patches
- Stunted growth
- Smaller leaves and reduced yields
Solutions:
- Apply phosphorus-rich fertilizer
- Use organic sources like bone meal
- Ensure proper pH (6.0-7.0 for soil)
- Warm the root zone (phosphorus uptake is reduced in cold soil)
Magnesium Deficiency
Nutrient Medium Severity
Symptoms:
- Interveinal chlorosis (yellowing between leaf veins)
- Starts in older leaves and progresses upward
- Leaf edges may turn yellow, then brown
- Leaves may develop a marbled appearance
Solutions:
- Apply Epsom salts (magnesium sulfate)
- Use Cal-Mag supplements
- Ensure proper pH (6.0-7.0 for soil)
- Don't overwater, as it can leach magnesium
Powdery Mildew
Disease High Severity
Symptoms:
- White powdery spots on leaves, stems and buds
- Powder spreads to cover entire leaf surfaces
- Affected leaves may yellow and die
- Stunted growth and reduced yields
Solutions:
- Improve air circulation
- Reduce humidity
- Apply treatments like neem oil or potassium bicarbonate
- Remove severely affected leaves
Bud Rot (Botrytis)
Disease High Severity
Symptoms:
- Fluffy gray or brown mold inside buds
- Buds become mushy and discolored
- Leaves attached to affected buds wither and die
- Initial symptoms often start inside dense buds
Solutions:
- Remove affected buds immediately
- Improve air circulation
- Reduce humidity below 50% during flowering
- Avoid wetting buds when watering
Heat Stress
Environment Medium Severity
Symptoms:
- Leaves curling upward (canoe or taco shape)
- Brown or burnt leaf edges
- Leaves feel dry and brittle
- Bleaching or yellowing of upper leaves
Solutions:
- Reduce temperature (ideal range: 20-28°C/68-82°F)
- Improve ventilation and air circulation
- Move grow lights further from plants
- Provide shade for outdoor plants during peak heat
Overwatering
Environment Medium Severity
Symptoms:
- Drooping leaves that feel firm and swollen
- Yellowing leaves throughout the plant
- Slow or stunted growth
- Algae growing on soil surface
Solutions:
- Allow soil to dry before watering again
- Check drainage holes in pots are clear
- Add perlite to soil for better drainage
- Water less frequently but deeply
Need More Specific Help?
If you're still unsure what's affecting your plants, our AI assistant can help provide personalized diagnosis based on your specific situation.