Plant care guide
Pilea Yellow Leaves With Brown Spots: Water, Disease or Sun?
Updated
Why are my Chinese money plant leaves turning yellow?
Yellow leaves on a Chinese money plant usually start in the pot: mix kept too wet, or roots rotting in an oversized pot. Yellow leaves with brown spots add a second clue. Spots with a yellow halo point to leaf spot disease, often after wet foliage, while dry brown or red-brown patches point to sun or cold.
What to do first
Check the mix and roots first. Then look closely at the spots: water-soaked with a yellow halo, dry and papery on the sunny side, or fine speckling with webbing underneath. Stop wetting the leaves, remove badly spotted ones, and fix watering and position.
Yellow leaves on a Chinese money plant are worrying. Brown spots on top make it look like disease. Sometimes it is, but the pot is still the first place to look.
NC State Extension’s Pilea peperomioides profile says the plant is susceptible to root rot if overwatered. It also warns that wetting the foliage can lead to leaf spots. Those two lines explain most yellow, spotted pileas.
Match the leaf to the cause
| What you see | Most likely cause |
|---|---|
| Yellowing on old and new leaves, mix damp, soft stems | Overwatering, root rot |
| Brown spots with a yellow halo, spreading, worse after misting | Leaf spot disease |
| Dry brown or red-brown patches on leaves facing the window | Too much direct sun |
| Dark or brown blotches after a cold night by the glass | Chilling injury |
| Yellow between the veins, veins still green | Nutrient shortage |
| Fine pale speckling, webbing under leaves | Spider mites |
| A few lowest leaves yellowing and falling, top healthy | Normal ageing |
Wet mix and rot
Virginia Cooperative Extension’s watering guide lists yellowing on both new and old leaves, mushy stems, rotten-smelling mix and fungus gnats as overwatering signs.
The RHS pilea growing guide says to water once the top few centimetres of compost start to dry. It warns that an overly large pot keeps compost damp too long, leading to root rot. Discard water that collects in the saucer.
Spots with a yellow halo: disease
Clemson Extension’s disorders factsheet describes fungal leaf spots as small brown spots with yellowish margins. They may show rings or tiny black dots in the dead tissue. Bacterial spots are water-soaked, sometimes with a yellow halo, and run together in wet conditions.
The UC IPM houseplant problems page names Pilea among common hosts of Xanthomonas bacterial leaf spot. It describes dark green, water-soaked spots that turn tan, brown or black with a yellow border, and can spread across the whole leaf.
Clemson advises against splashing water on the foliage, because it spreads leaf spot fungi. For bacterial spots it adds avoiding low temperatures and crowded plants.
Dry brown patches: sun or cold
The RHS links red-brown flushed leaves to too much direct sun. It recommends bright but indirect light near a north-, east- or west-facing window. UC IPM lists sunburn after a recent move as a cause of leaf spots and blotches.
UC IPM also lists chilling below 10 °C (50 °F). The RHS says to keep pileas out of cold draughts and always above 10 °C (50 °F). A leaf touching winter glass can be chilled even in a warm room.
Yellow between the veins
The RHS says yellowing between the leaf veins is usually a nutrient deficiency, and suggests a balanced houseplant feed. It recommends feeding every month or two from April to September, and warns that overfeeding can do more harm than good.
Pests
NC State lists spider mites, mealybugs, fungus gnats and scale for this plant. UC IPM describes mite damage as yellowed leaves with tiny speckling, later bronzed and dry, with webbing near the growing points.
What to do
- Check the mix. If it is wet below the surface, stop watering and empty the saucer.
- Check the roots if stems are soft. Clemson says that if only a few roots are infected, cut them out and repot in sterile mix. Use a pot only a couple of centimetres larger, as the RHS advises.
- Stop wetting the leaves. Water the mix, not the foliage, as NC State suggests.
- Remove badly spotted leaves and throw them away, as Clemson recommends. Give the plant room for air to move around it.
- Move the plant out of direct sun and away from cold glass and draughts.
- Feed lightly in spring and summer if yellowing sits between the veins.
- Check leaf undersides with a hand lens before using any pest treatment.
Spotted and yellow leaves will not recover. Judge the fix by the new leaves at the top of the stem.
If leaves are falling rather than spotting, see our pilea leaves falling off guide. For more on spot diseases, read leaf spot diseases on houseplants. For full care, see the Chinese money plant care guide.
Related guides
Other chinese money plant problems we cover: overwatering, curling leaves.
References
- NC State Extension Gardener Plant Toolbox: Pilea peperomioides
- Royal Horticultural Society: How to grow pilea
- Clemson Cooperative Extension, HGIC 2251: Houseplant Diseases & Disorders
- UC Statewide IPM Program: Pest Notes, Houseplant Problems
- Virginia Cooperative Extension: Properly Watering Container Houseplants (SPES-804)
How this guide was put together: NC State Extension, RHS, Clemson Cooperative Extension, UC Statewide IPM Program and Virginia Cooperative Extension guidance.