- Plant disease identifier apps at a glance
- Ten plant disease identifier apps to try
- Which diagnosis app fits your plants
- When a sick plant should be reported, not just treated
- How to photograph a sick plant for a better diagnosis
- Disease, pests or care problems
- Signs a plant problem is spreading
- My plain advice on plant disease identifier apps
- Frequently asked questions
A plant disease identifier app looks at a photo of a sick leaf, stem or fruit and suggests what's wrong, from fungal spots to pests and watering problems. Some suit houseplants, some suit vegetable gardens and crops, and some add care plans or regional alerts. Treat any result as a starting point. Ten options follow, in no particular order.
Yellow leaves, brown spots, white powder, wilting stems: plants have plenty of ways to tell you something's wrong and very few ways to say what. Plant disease apps turn a photo into a likely cause and suggest what to do next.
The ten apps below include plant care apps with a diagnosis feature, dedicated disease scanners and crop apps built for farmers. They're listed alphabetically and in no particular order, and every description comes from each provider's own website or App Store listing, read this week. If you grow vegetables, my guide to when to plant tomatoes outside helps you avoid some problems before they start.
Plant disease identifier apps at a glance
I checked the free plan column on each tool's own website or App Store listing, as of Oct 2026. Yes means the page says the tool, a plan or a version of the tool is free. Trial only means a time-limited trial. Not stated means the page I read named neither, even where there's a button inviting you to start, so check before you sign up.
| Tool | Type | Good for | Free plan |
|---|---|---|---|
| Agrio | Plant diagnosis app with alerts | Pest and disease alerts for your area | Yes |
| Blossom | Plant care and disease ID app | A plant doctor for houseplants | Not stated |
| Garden Answers | Plant identification and garden Q&A app | Instant answers to garden questions | Yes |
| PictureThis | Plant identifier app | Plant ID with disease and toxicity notes | Yes |
| Plant Disease Identifier | Plant diagnosis app for iPhone | A dedicated plant disease scanner | Yes |
| Plant Parent | Plant care app with diagnosis | Care reminders plus a diagnosis | Yes |
| Planta | Plant care app | Treatment plans for sick houseplants | Not stated |
| PlantIn | Plant identifier and care app | Disease and pest ID with a botanist | Not stated |
| Plantix | Crop diagnosis app for farmers | Crop problems on farms and allotments | Yes |
| Plantora | Free plant identifier and care app | A completely free disease checker | Yes |
Ten plant disease identifier apps to try
Agrio
Best for: Growers who want a plant diagnosis app that alerts them when diseases and pests are expected to reach their region.
Blossom
Best for: Houseplant owners who want to snap a photo, identify the cause of a problem and get disease and care information.
Garden Answers
Best for: Home gardeners who want free plant identification and answers to garden questions, including plant diseases and pests.
PictureThis
Best for: Gardeners who want instant plant ID from a photo with notes on disease prevention, treatment and toxicity.
Plant Disease Identifier
Best for: Plant lovers who want an iPhone app made specifically for plant diagnosis, free to download with in-app upgrades.
Plant Parent
Best for: New plant owners who want to identify and diagnose plants and get reminders, free to download with in-app upgrades.
Planta
Best for: Houseplant owners who want a care app whose plant doctor feature diagnoses problems and sets up a treatment plan.
PlantIn
Best for: Gardeners who want disease and pest identification plus the option to ask a botanist for help.
Plantix
Best for: Farmers and allotment growers who want a free app to diagnose and treat crop problems and pick up farming knowledge.
Plantora
Best for: Thrifty gardeners who want a plant identifier with disease identification that describes itself as completely free.
Which diagnosis app fits your plants
- Houseplants that look unwell: a care app with a plant doctor, such as Planta.
- Vegetables and allotment crops: Plantix.
- Warnings before trouble arrives: regional alerts from Agrio.
- A human second opinion: PlantIn, which lets you ask a botanist.
- Everyday garden questions: Garden Answers.
- A completely free option: Plantora.
When a sick plant should be reported, not just treated
Most plant problems are local: overwatering, a bit of mildew or aphids. But some pests and diseases spread fast and threaten crops, trees and gardens across a whole country.
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The UK Plant Health Information Portal runs a service to report a pest or disease, and it asks people not to bring plants back from their holidays because pests and diseases can travel with them. So if an app suggests something serious or unusual, especially on trees or crops, report it through the official channel rather than only treating it at home.
How to photograph a sick plant for a better diagnosis
- Photograph the problem up close in daylight, on both sides of the leaf.
- Add a second photo of the whole plant, so the app sees the pattern.
- Include any pests you can see, plus webbing, holes or droppings.
- Note recent changes: watering, a new spot, cold nights or repotting.
- Compare the app's top suggestions instead of trusting the first one.
Disease, pests or care problems
Many plants that look diseased are really reacting to their care. Too much water, too little light or a cold draught can cause yellowing, drooping or brown tips that look like disease.
Before treating anything, check the basics: soil moisture, light, temperature and drainage. If the problem spreads to new leaves or nearby plants, that's a stronger sign of disease or pests.
Signs a plant problem is spreading
- New leaves show the same marks. Act quickly.
- Nearby plants start to look unwell. Isolate the first plant.
- You see insects or webbing. It may be pests, not disease.
- Stems turn soft or black. Check the roots for rot.
Do you make a plant disease identifier app? Tool makers can ask to be considered for a featured place on this list.
My plain advice on plant disease identifier apps
Use an app to narrow down the cause, then check the care basics before you buy any treatment. Isolate a sick houseplant from the others while you work it out, and take photos every few days so you can see whether things improve.
Healthy plants start with good timing. My guide to when to plant pumpkins is a seasonal example.
Frequently asked questions
Can an app identify plant diseases from a photo?
Yes, many apps suggest likely diseases, pests or care problems from a photo, but treat the result as a starting point.
Are plant disease identifier apps free?
Some are free and others are free to download with in-app upgrades. Check each app's own page or listing.
Why are my plant's leaves turning yellow?
Yellow leaves often come from too much or too little water, poor light or nutrient problems, as well as disease. Check the care basics first.
Should I report a plant disease?
If it's serious or unusual, especially on trees or crops, report it through your country's official plant health service.
Can I trust a plant app's treatment advice?
Use it as a guide. Confirm the diagnosis, check care conditions and follow product labels for any treatment you use.
How do I stop a plant disease spreading?
Isolate the plant, remove badly affected leaves, clean tools and avoid splashing water between plants.
