Start here: a quick check
- Feel the soil. Soggy points to overwatering; bone dry points to underwatering.
- Look at which leaves are yellow. Old, lower leaves suggest watering, light, or nutrients. New leaves suggest nutrient or root problems.
- Check under the leaves for pests.
- Think about recent changes — a new spot, repotting, or a heating season can all trigger yellowing.
1. Overwatering
Signs: The most common cause. Leaves turn soft and yellow, often starting low on the plant, and the soil stays wet for days.
Fix: Let the top few centimeters of soil dry before watering again. Make sure the pot drains, and empty saucers after watering.
2. Underwatering
Signs: Leaves yellow, then turn crispy and brown at the edges. The soil pulls away from the pot.
Fix: Water thoroughly until it drains, then check the soil more often. Very dry soil may need bottom-watering to rehydrate.
3. Not enough light
Signs: Lower leaves yellow and drop while new growth is small or stretched toward the window.
Fix: Move the plant closer to a bright window with indirect light, or add a grow light.
4. Nutrient deficiency
Signs: Older leaves yellow evenly (often nitrogen), or new leaves yellow between green veins (often iron or magnesium).
Fix: Feed with a balanced houseplant fertilizer during spring and summer. Repot plants that have been in old soil for years.
5. Temperature stress or drafts
Signs: Sudden yellowing after the plant sits near a heater, air conditioner, or cold window.
Fix: Move it away from vents and drafty spots. Most houseplants like a steady room temperature.
6. Pests
Signs: Yellow speckling, sticky leaves, fine webbing, or tiny insects under leaves.
Fix: Isolate the plant, wipe leaves, and treat with insecticidal soap or neem oil. Repeat weekly until clear.
7. Natural aging
Signs: One or two of the oldest, lowest leaves yellow slowly while the rest of the plant looks healthy.
Fix: Nothing to fix — this is normal. Remove the leaf once it's fully yellow.
Should you cut off yellow leaves?
Yes, once a leaf is mostly yellow it won't turn green again. Removing it with clean scissors keeps the plant tidy and helps you spot whether new yellowing appears. Focus on fixing the cause first. If yellowing continues, see our guide to diagnosing plant problems.
Let PlantBetter help
Take a photo of the yellow leaves and PlantBetter will help you narrow down the cause and suggest a fix — then remind you when it's actually time to water.