symptom diagnostics
What's wrong with my plant? 60-second triage guide
Diagnose what's wrong with your plant in under a minute. Yellow leaves, drooping, curling, spots — the 7 most common causes, ranked, with photo CTA.
What's wrong with my plant? 60-second triage guide
If you Googled this question with a slightly panicked feeling, you're in the right place. This guide is the 60-second triage: four quick checks, seven probable causes, one ranked diagnosis. No fluff, no scrolling 12 paragraphs about the history of houseplants.
Skip the reading, ask Growli: Open the Growli app, snap a photo of the affected leaves, answer 3 questions about your watering routine. Growli ranks the most likely cause and gives a 7-day recovery plan in under a minute.
The 60-second triage
Answer these four questions in order. Each branches the diagnosis.
Question 1: What does the soil feel like?
Push a finger 2 inches into the soil.
- Wet 2-3 days after watering → overwatering is the leading suspect. Skip to Cause 1.
- Bone dry, soil pulling away from pot → underwatering. Skip to Cause 2.
- Slightly moist, not soggy → soil isn't the problem. Continue to Question 2.
Question 2: What's the leaf pattern?
- Yellow leaves starting at the bottom → overwatering (most common) or natural aging.
- Yellow leaves on new growth → iron or nitrogen deficiency.
- Curling inward (cupping) → heat stress, low humidity, or pests on the underside.
- Drooping with soft stems → root rot, often advancing fast.
- Brown crispy edges → underwatering, salt buildup, or fluoride in tap water.
- White patches or webs → pests (spider mites, mealybugs) or powdery mildew.
- Black spots or dark patches → fungal disease.
Question 3: New growth or old growth?
- Only the oldest leaves affected → environmental cause (water, light, age).
- New growth coming out distorted or stunted → pest, virus, or herbicide damage. Treat seriously.
- Both → likely advanced overwatering with root rot.
Question 4: Indoor or outdoor?
- Indoor → check heating vents, AC drafts, recent repot, fertilizer schedule.
- Outdoor → check pesticide drift from neighbors, recent weather (frost, heatwave, hailstorm).
After these four questions you'll have a clear leading hypothesis. Match it to the cause below. If you also need to nail down the species first, walk through our plant identification flow — diagnosis gets much sharper when you know what you are looking at.
The 7 most common plant problems, ranked
Statistically — across thousands of diagnosis queries Growli has handled — this is the frequency ranking for indoor plants in US and UK homes:
| Rank | Cause | % of cases | Symptom signature |
|---|---|---|---|
| 1 | Overwatering / root rot | ~40% | Yellow lower leaves on wet soil; soft stem at base |
| 2 | Insufficient light | ~15% | Slow growth, smaller new leaves, plant leans toward window |
| 3 | Underwatering | ~12% | Crispy edges, soil pulled away from pot, wilting that recovers when watered |
| 4 | Nutrient deficiency | ~10% | Yellowing with green veins, slow new growth |
| 5 | Pests (spider mites, fungus gnats, mealybugs) | ~10% | Webs, dots, sticky residue, tiny flies hovering |
| 6 | Disease (root rot, powdery mildew, leaf spot — see the houseplant diseases hub) | ~8% | Black spots, white powdery coating, slime |
| 7 | Environmental stress (temperature, drafts) | ~5% | Sudden leaf drop, curling, transplant shock |
The other 5% covers chemical damage (cleaner overspray, hard water salts), pet damage, and unusual species-specific issues.
Why your gut diagnosis is usually wrong
Two patterns I see constantly:
Pattern 1: "It looks thirsty, I'll water it." Half the time it's already overwatered. Yellow leaves and droopy posture look identical whether the roots are drowning or parched. The only reliable signal is the soil. Always check soil moisture before reaching for the watering can.
Pattern 2: "It's getting plenty of light." Most "well-lit" rooms are 5-10x dimmer than the plant evolved to handle. The human eye adapts; the plant doesn't. If you've moved a nursery plant into a "bright" interior corner, it's probably getting 5% of the light it expects.
When in doubt: water less, give more light, leave it alone.
Quick-jump to specific symptoms
For deeper diagnosis on each symptom, the sibling guides:
- Yellow leaves → Why are my plant leaves turning yellow? — the 5 causes ranked
- Curling leaves → Why are my plant leaves curling? — 6 causes
- Dying succulent → Why is my succulent dying? — the 4-step rescue protocol
- Pests → Common houseplant pests guide — identification + treatment
How AI diagnosis works (the Growli approach)
Photo-only plant ID apps tell you the species. Growli tells you what's wrong with your specific plant in your specific conditions. The difference:
PictureThis / PlantNet flow:
- Photo in.
- Species name out.
- Static FAQ page.
Growli flow:
- Photo of the symptom in.
- Growli asks: "When did you last water?"
- You answer.
- Growli asks: "Have you repotted in the past month?"
- You answer.
- Growli ranks the most likely diagnosis, weighted by your answers.
- You can ask follow-ups: "What if I've already tried that?"
This is the wedge. Symptom diagnosis is a conversation, not a lookup. We unpack the trade-offs in detail in our AI plant diagnosis app comparison.
Try the conversation: Open Growli and describe what you're seeing. The first diagnosis takes about 60 seconds.
When to escalate beyond AI
A small number of cases warrant calling a human:
- Commercial-scale damage (whole greenhouse, garden plot dying) → your local university extension service. In the US, every state has a master gardener program; in the UK, the RHS Advisory service.
- Suspected fast-spreading viral infection → bag the plant and remove it. Send a sample to your extension service if multiple plants are showing the same distorted new growth.
- Pet ate something and is sick → ASPCA Animal Poison Control: 1-888-426-4435 (US). In the UK, the Veterinary Poisons Information Service via your vet.
Growli is calibrated to flag cases where AI confidence is low and recommend escalation. You won't get a confident wrong answer on something that needs a specialist.
Action plan — the next 24 hours
- Now (1 min): Do the 4-question triage above. Identify your most likely cause.
- Next 4 hours: Apply the matching fix. If overwatering — stop watering, check drainage. If under — soak the pot. If pests — isolate the plant.
- Day 3: Reassess. New growth coming in green is the recovery signal.
- Day 7: If symptoms continue, unpot and inspect roots. Or open Growli for a fresh diagnosis pass.
Related articles
- Why are my plant leaves turning yellow? — the most common single symptom
- Why are my plant leaves curling? — second-most-common
- Why is my succulent dying? — succulent-specific deep-dive + rescue protocol
- Common houseplant pests — when the cause is bugs, not water
Reviewed and updated by the Growli editorial team. For questions about anything here, open Growli and ask — or email hello@getgrowli.app.
Frequently asked questions
How do I figure out what's wrong with my plant?
Start with the soil moisture — overwatering is the most common cause of every symptom (yellow leaves, drooping, root rot). If the soil is dry, check whether the plant is in too much sun. Then look at the leaf pattern — bottom-up yellowing is usually water; new-growth distortion is usually pest or virus. The 60-second triage above resolves most cases.
Is there an app that tells you what's wrong with your plant?
Yes — Growli is built specifically for this. Open the app, photograph the affected leaves and the whole plant, and answer 3 questions about your watering and light. Growli matches your symptom pattern against the most common causes and gives a ranked diagnosis. Unlike static plant-ID apps, Growli supports follow-up questions: 'What if it's still drooping after I water?'
What's the difference between Growli and PictureThis for diagnosing problems?
PictureThis identifies the species and shows static FAQ pages. Growli has a back-and-forth conversation — you describe symptoms, Growli asks clarifying questions (recent repot? draft? new fertilizer?), and the diagnosis adapts to your specific situation. For symptom diagnosis specifically, the conversation is the wedge.
My plant has yellow leaves AND is drooping — which problem is it?
Almost certainly overwatering with advancing root rot. Yellow + droop + wet soil = unpot today and inspect the roots. White firm roots are healthy; brown slimy roots are rotted and need to be cut off. See the rescue protocol in the why-is-my-succulent-dying guide — the same protocol works for most houseplants.
Should I worry if only one leaf is yellow?
No — older plants drop their oldest leaves naturally. If just the lowest leaf on the plant is yellowing while everything else looks fine, that's normal. Worry when 2+ leaves yellow within a week, when the top growth is affected, or when the stem feels soft.
What's the most common mistake when diagnosing a plant problem?
Watering a plant that's already overwatered. When leaves yellow or droop, most owners reach for the watering can — and accelerate the root rot. Always check soil moisture first; a finger pushed 2 inches into the soil tells you more than any visual symptom.
How fast can Growli diagnose a problem?
Typically 30-60 seconds from opening the app: snap a photo, describe symptoms, answer 3 clarifying questions, receive ranked diagnosis. For more complex cases (multiple symptoms, recent stressors), the conversation can go a few rounds. Most diagnoses converge on the right answer within 2 minutes of dialog.
Will an AI miss something a human expert would catch?
For common houseplant problems (overwatering, light, common pests), Growli's diagnostic accuracy matches expert recommendations from horticulture extension services. For commercial-scale issues, fast-spreading viral infections, or unusual species, your local university extension service or a certified arborist will catch nuances an AI misses. Growli is calibrated to recommend escalation when confidence is low.