Yellow leaves on a houseplant are a symptom, not a disease, and the pattern tells you the cause. One or two of the oldest, lowest leaves turning yellow while new growth looks healthy is normal aging. Several leaves yellowing at once, with soil that stays damp for days, almost always means overwatering or poor drainage. Pale, washed out leaves across the whole plant usually point to low light or a lack of nutrients. Check the soil moisture first, then light, then feeding. A yellow leaf will not turn green again, so the goal is to stop new yellowing, then remove damaged leaves once the cause is fixed.
Read the pattern first
Before you change anything, look closely at where the yellow shows up and how it looks.
| What you see | Most likely cause |
|---|---|
| Lowest one or two leaves yellow, rest healthy | Normal aging |
| Many leaves yellow and soft, soil damp for days | Overwatering or poor drainage |
| Yellow leaves with crispy brown edges, soil bone dry | Underwatering |
| Whole plant pale, leaning toward the window | Too little light |
| Older leaves evenly pale, slow growth for months | Low nitrogen |
| Yellow speckles or stippling, fine webbing | Spider mites or thrips |
| Sudden yellowing after a move or repot | Shock or cold draft |
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Find My Plants →Overwatering is the most common cause
Roots need air as much as water. When potting mix stays wet, the roots cannot breathe, start to die back, and the plant can no longer move water and nutrients to the leaves. The leaves then yellow even though the soil is wet, which fools many people into watering again.
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Push a finger or a moisture meter 2 inches into the mix before every watering. Most common houseplants want that layer dry before you water again. Use pots with drainage holes, empty saucers 15 minutes after watering, and water less often in the darker, cooler months when growth slows. If the plant wilts while the soil is wet or the stems feel mushy at the base, check the roots for rot right away. Our guide to root rot in houseplants walks through the rescue.
Underwatering and dry air
A plant that dries out completely between drinks often drops its lower leaves after they yellow and crisp at the edges. Water slowly until it runs from the drainage holes, so the whole root ball gets wet. Very dry potting mix can shrink from the pot wall and shed water down the sides; soak the pot in a basin for 20 minutes to rewet it. Heated rooms also pull moisture out of leaves, so grouping plants or running a humidifier helps tropical types.
Too little light
Light is food for a plant. In a dim spot, a plant cannot support all its leaves, so it sheds the oldest ones and grows pale, stretched new stems. Move it closer to a bright window, rotate it every week or two, and add a grow light on a timer for 12 to 14 hours a day in rooms that stay dim. Short days in the cooler months make this cause much more common.
Nutrient shortages and salt buildup
Plants that have sat in the same mix for years without feeding often show even yellowing on older leaves first, because nitrogen moves from old leaves to new growth. Feed with a balanced liquid fertilizer at half strength every four weeks while the plant is actively growing, and skip feeding when growth stalls. White crust on the soil or pot rim means salt buildup from fertilizer or hard water. Flush the pot by running plain water through it for a minute, or repot into fresh mix.
Drafts, moves, and repotting shock
Cold drafts from doors and single pane windows, or blasts of hot air from vents, can yellow leaves within days. So can a move to a new spot or a fresh repot. Keep tropical plants away from cold glass and heat registers, and give a newly moved plant two to three weeks to settle before you change anything else.
What to do with the yellow leaves
Once you know the cause, snip yellow leaves off at the base with clean scissors. They will not recover, and removing them keeps the plant tidy and lets you see whether new yellowing has stopped. If more than a third of the plant is yellow, fix the cause first and remove the leaves in stages.
Safety notes
Many popular houseplants, including pothos, philodendron, and dieffenbachia, are toxic to pets if chewed. Keep fertilizer out of reach of children and pets, and store it in its original labeled container. If a child swallows or splashes any garden chemical, call Poison Control at 1-800-222-1222. If a pet eats it, call your veterinarian or the ASPCA Animal Poison Control Center at (888) 426-4435.
Bottom line
Check the soil before you water, give the plant brighter light, and feed lightly only while it grows. A few yellow lower leaves are normal. Widespread yellowing with wet soil means you should cut back on water and check the roots.
Related reading
- Soil moisture meters for houseplants in winter
- Grow light basics for winter houseplants
- When to repot houseplants in winter
- Spider mites on houseplants in dry heat
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