Is There a Free App to Detect Plant Problems?
Yes. The identify this plant app at identifythisplant.app detects plant problems for free, including fungal diseases (powdery mildew, leaf spot, root rot), pest infestations (aphids, spider mites, scale, mealybugs), and nutrient deficiencies (yellowing, browning, stunted growth). Snap a photo of the affected leaf or stem and the AI returns the likely diagnosis plus treatment steps in seconds — first diagnosis free, no app download required.
What it can diagnose
Fungal diseases
- Powdery mildew (white powder on leaves)
- Leaf spot (brown/black spots, often with yellow halo)
- Root rot (wilting despite wet soil, mushy black roots)
- Rust (orange-brown pustules on leaf undersides)
- Botrytis / gray mold
Pests
- Aphids (small green/black clusters on new growth)
- Spider mites (fine webbing, stippled leaves)
- Scale insects (waxy bumps on stems)
- Mealybugs (white cottony masses)
- Thrips, whiteflies, fungus gnats
Nutrient & care issues
- Nitrogen deficiency (uniform yellowing of older leaves)
- Iron chlorosis (yellow leaves with green veins)
- Overwatering (yellow + wilting + soft stems)
- Underwatering (crispy brown edges)
- Sunburn vs cold damage
How to use it for diagnosis
- Open identifythisplant.app
- Photograph the affected area close-up — discolored leaf, pest cluster, wilting stem
- Upload the photo
- The AI returns the species ID + likely problem diagnosis + treatment plan
Photo tips for diagnosis
For accurate plant problem detection:
- Get close. A wide shot of a sad plant tells the AI less than a close-up of the affected leaf.
- Capture both sides of the leaf. Many pests hide on the underside.
- Take 2–3 angles — one of the spotted leaf, one of the whole plant, one of the soil surface if you suspect a soil-borne issue.
When to consult a pro
AI plant problem detection is a fantastic first step — about 95% accurate for common issues. For high-value plants showing severe symptoms, follow up with your local extension office or a certified arborist. The AI diagnosis is a starting point, not a substitute for in-person assessment of dying or rare specimens.
Other free options
PlantNet and iNaturalist focus on identification, not problem diagnosis. Picture This includes problem diagnosis but charges $29.99/year for it. The identify this plant app gives you both — free first identification with diagnosis included. See our free plant identifier comparison for the full landscape.