Plant care guide
Calathea Yellow Leaves: Water, Light, Feeding or Pests?
Updated
Why are my Calathea leaves turning yellow?
Yellow leaves on a calathea (sold as prayer plant) most often come from watering: mix that stays wet, or mix left to dry out. UF/IFAS also names too little fertilizer and too much light, and drafts and spider mites cause yellowing too. One old outer leaf yellowing slowly is normal.
What to do first
Note which leaves are yellow, then feel the mix well below the surface. Wet mix means stop watering and check the roots; dry mix means water thoroughly. If the mix is right, check light, feeding, drafts and leaf undersides.
Yellow leaves on a calathea look alarming, but the pattern narrows the cause quickly. Note which leaves turned, how many, and what the mix feels like before you water again.
“Prayer plant” is used for more than one plant. NC State Extension lists it as a common name of the rattlesnake plant, Goeppertia insignis, and the ASPCA’s prayer plant entry is Calathea insignis. If your plant has red, fishbone-patterned veins, it is probably Maranta leuconeura. Our prayer plant care guide covers that one.
Read the Pattern
| What you see | Most likely cause |
|---|---|
| One older, outer leaf yellows slowly; new leaves healthy | Normal aging |
| Old and new leaves yellow together, mix wet or sour | Overwatering, root damage |
| Lower leaves yellow and crisp, mix dry, pot light | Mix dried out too long |
| Whole plant pale, slow growth, not fed for months | Too little fertilizer |
| Yellowing or bleaching on leaves facing a bright window | Too much light |
| Yellowing with dry edges near a door, vent or cold glass | Drafts |
| Fine speckling, yellowing or silvery leaves, maybe webbing | Spider mites |
UF/IFAS Extension’s Calathea guide lists three causes of leaf chlorosis: low fertilizer, overwatering or high light. NC State says yellowing on G. insignis can result from either underwatering or overwatering.
The RHS houseplant problems page links old and new leaves yellowing and dropping together, with dark, mushy roots, to overwatering. It links drafts with yellowing and dry leaf edges. Its calathea guide names red spider mite, which shows as speckled, yellowing or silvery leaves with fine webbing.
Clemson Extension’s disorders factsheet says yellowing is most often a symptom of overwatering. It links lower-leaf yellowing to nitrogen or iron deficiency, especially in pot-bound plants.
Check the Mix and Roots First
Watering is the most common cause, and the fix depends on which way it went wrong.
- Push a finger into the mix. Virginia Cooperative Extension’s watering guide suggests 2.5–7.5 cm (1–3 in), depending on pot size. Lift the pot as well.
- If it is wet and heavy, stop watering. Slide the plant out. Brown to black, soft roots mean rot; cut them away and repot in fresh mix. The calathea drooping guide walks through the root check.
- If it is dry and light, water thoroughly. Water until it drains, then empty the saucer. Virginia lists brown tips, curled leaves and mix shrinking from the pot edge among underwatering signs.
- Then water by condition. UF/IFAS advises letting the surface dry slightly before watering. NC State asks for mix that is moist but not wet in spring and summer, with less water in winter.
If the Roots and Mix Are Fine
Light. Move the plant out of direct sun. NC State’s Goeppertia profile warns that direct sunlight can scorch leaves. Our calathea sunburn guide covers window-facing damage.
Feeding. NC State suggests a balanced fertilizer monthly in spring and summer, less in winter. UF/IFAS recommends nitrogen and iron for chlorosis caused by low fertility. Do not overcorrect: it links excess fertilizer to brown margins and tips.
Drafts and cold. NC State says the rattlesnake plant does not tolerate drafts or sudden temperature changes. Keep it away from exterior doors, vents and cold glass.
Pests. Check leaf undersides with a hand lens. If you find mites, isolate the plant before treating.
What to Do With Yellow Leaves
A yellow leaf will not turn green again. Leave a leaf that is still partly green; it still feeds the plant. Cut off a leaf that is mostly yellow at the base of its stalk with clean scissors.
Judge the fix by the next leaves to unfurl. If they stay green, you found the cause.
If the edges are brown rather than the blade yellow, see our calathea water quality guide. For Goeppertia orbifolia, see the orbifolia yellow leaves guide. Our yellow leaves decision tree covers the general method, and the calathea hub lists our other guides.
References
- UF/IFAS Extension: Cultural Guidelines for Commercial Production of Interiorscape Calathea (EP285)
- NC State Extension Gardener Plant Toolbox: Goeppertia insignis
- NC State Extension Gardener Plant Toolbox: Goeppertia
- RHS: How to help a poorly houseplant
- RHS: How to grow calatheas
- Clemson Cooperative Extension, HGIC 2251: Houseplant Diseases & Disorders
- Virginia Cooperative Extension: Properly Watering Container Houseplants (SPES-804)
- ASPCA Animal Poison Control Center: Prayer Plant
How this guide was put together: UF/IFAS Extension, NC State Extension, Clemson Cooperative Extension, Virginia Cooperative Extension, RHS and ASPCA guidance.