Quick diagnosis: read the pattern
| What you see | Most likely cause |
|---|---|
| Many leaves yellowing at once, soil stays wet, mushy stems | Overwatering / early root rot |
| Leaves yellow with crispy brown edges, soil bone-dry, pot light | Underwatering |
| Pale, washed-out yellow on the side facing away from the window | Not enough light |
| Older leaves yellow between the veins, new growth small | Nutrient deficiency (usually nitrogen) |
| Yellow stippling or speckles, fine webbing under leaves | Spider mites |
| One old, lowest leaf yellowing while the rest look great | Normal aging — not a problem |
1. Overwatering (the #1 cause)
Monsteras like to dry out partway between waterings. When the soil stays wet, roots suffocate and start to rot, and the plant can’t move water — so leaves yellow, often several at once, sometimes with dark blotches.
Fix: Stop watering. Check the roots: healthy roots are firm and white; rotting ones are brown and mushy. Trim any rot, repot into fresh, chunky aroid mix in a pot with drainage, and only water again when the top 5 cm of soil is dry. See our full guide to root rot symptoms and rescue.
2. Underwatering
The opposite problem looks confusingly similar. The tell: dry, crispy leaf edges, soil pulling away from the pot walls, and a pot that feels light. Our side-by-side guide to overwatering vs underwatering symptoms covers the differences in detail.
Fix: Water thoroughly until it drains from the bottom, then set a schedule you’ll actually keep (roughly every 1–2 weeks indoors — see how often to water a monstera).
3. Not enough light
Monsteras tolerate medium light but thrive in bright, indirect light. In a dark corner, the plant can’t photosynthesize enough and sacrifices leaves — they fade to a pale, even yellow.
Fix: Move it within 1–2 m of a bright window, out of harsh direct midday sun (which scorches instead).
4. Nutrient deficiency
If your monstera hasn’t been fed or repotted in over a year, yellowing that starts on older leaves — often between the veins — points to nitrogen or magnesium running out.
Fix: Feed with a balanced liquid fertilizer (e.g. 10-10-10) monthly during spring and summer. Don’t fertilize a stressed, freshly repotted or bone-dry plant.
5. Pests
Spider mites pierce leaf cells and leave yellow speckling; look for fine webbing on the underside. Scale and mealybugs also drain sap and yellow leaves. Guides: spider mites, mealybugs.
6. Normal aging
If it’s a single old leaf at the bottom of the plant and everything else looks healthy, relax — monsteras retire their oldest leaves as they grow. Just trim it off.
Not sure which cause it is? Scan it.
Open FloraCure, point your camera at the yellowing leaves, and the AI will tell you whether it’s overwatering, a deficiency, or pests — with a confidence score, a severity rating and a step-by-step treatment plan tuned to your local weather and season.
Coming soon to Google Play →Prevent it coming back
- Water only when the top 5 cm of soil is dry — a reminder in FloraCure removes the guesswork.
- Use a chunky, fast-draining aroid mix and a pot with drainage holes.
- Keep humidity around 50–60% — FloraCure’s weather alerts warn you when local conditions raise fungal disease risk.
- Feed monthly in the growing season, not in winter.
