Sick plant diagnosis
Sick plant: understand symptoms and act
A yellow leaf does not always mean underwatering. A brown spot is not always a disease. This guide helps classify visible symptoms and choose the most cautious first action.
Quick diagnosis by symptom
| Visible symptom | Likely cause | First action |
|---|---|---|
| Yellow leaves + wet soil | Overwatering or suffocating roots | Let it dry, check drainage, and inspect roots if the smell is suspicious. |
| Soft leaves + dry soil | Underwatering or hydrophobic root ball | Rehydrate gradually, then drain the pot well. |
| Dry brown spots | Direct sun, dry air, or irregular watering | Move away from harsh sun and stabilize watering. |
| Cottony white dots | Mealybugs | Isolate the plant, remove visible clusters, and treat quickly. |
| Small black insects around the pot | Fungus gnats | Let the surface dry and treat larvae in the substrate. |
5 checks before treating
The wrong treatment can make the situation worse. Before adding water, fertilizer, or a product, check the most common causes.
- Feel the soil deeper down, not only at the surface.
- Look under leaves and around nodes for pests or fine webbing.
- Check whether the pot has drainage and whether water sits in the cover pot.
- Identify recent changes: repotting, moving, drafts, heating, direct sun.
- Compare affected leaves: old lower leaves, young leaves, or the whole plant.
What to avoid
| Common reflex | Why it is risky | Do this instead |
|---|---|---|
| Watering as soon as a leaf turns yellow | If the cause is overwatering, it speeds up root rot. | Check moisture and roots before watering. |
| Fertilizing a weak plant | A stressed plant absorbs poorly and roots can burn. | Stabilize light and watering, then fertilize during growth. |
| Treating every symptom as pests | Spots and yellow leaves often come from growing conditions. | Look for visible insects before insecticide. |
| Repotting immediately | Repotting adds stress if roots are healthy. | Repot only if substrate is unsuitable, roots are damaged, or the pot is saturated. |
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Join the private betaFrequently asked questions
How do I know if my plant is overwatered?
Typical signs are soil that stays wet, soft yellow leaves, a stagnant smell, and sometimes brown or black roots. Let it dry and check drainage before watering again.
Should I cut sick leaves?
Remove dead, heavily damaged, or pest-covered leaves to limit spread and make observation easier. Keep lightly marked leaves if they are still green and useful to the plant.
When should I isolate a sick plant?
Isolate it as soon as you see insects, white clusters, fine webbing, silvery marks, or moving dots. Isolation limits spread to other plants.
Can a sick plant recover?
Often yes, especially when the issue is watering, light, or an early pest problem. Recovery depends on root health, remaining healthy foliage, and how quickly you act.