Calathea problems and how to fix them
5 common issues for Calathea orbifolia. Click any problem below to jump to its diagnosis and treatment.
Most Calathea problems trace back to one of three things: light, water, or humidity. Before assuming the worst, double-check the basics in our Calathea care guide. If conditions look right and the symptoms persist, work through the matching problem section below.
Brown tips
Symptoms
- Leaf tips turn crispy brown, sometimes with a yellow halo where green meets brown
- Browning starts at the very tip and spreads inward over weeks
- Mostly affects the oldest leaves first, but new growth can be affected if conditions stay poor
- Brown areas feel papery and snap when bent, not soft
Most likely causes
- Low humidity. Heating and air conditioning can drop indoor humidity below 30%, well under what most tropicals need (40–60%). Tips are the furthest point from the roots and dry out first.
- Inconsistent watering. Long dry spells followed by heavy watering shock the root tips. The damaged tissue shows up as browned leaf tips a week or two later.
- Mineral build-up from tap water. Fluoride and chlorine in city water accumulate at leaf tips. Some plants — Spider Plant, Calathea, Peace Lily — are especially sensitive.
How to fix
- Group plants together to raise local humidity, or place on a tray of pebbles with water below the pot base.
- For sensitive plants, switch to filtered, distilled, or rainwater. Or fill a jug from the tap and let it sit uncovered for 24 hours so chlorine evaporates.
- Trim brown tips with clean scissors at an angle, leaving a thin brown line — cutting into green tissue causes more browning.
- Establish a more consistent watering rhythm: check soil moisture once a week and water when the top 2–3cm are dry.
How to prevent next time
- Maintain humidity above 40% with a small humidifier in winter
- Stick to one water source — tap, filtered, or rain
- Avoid placing plants directly above heating vents or radiators
Curling leaves
Symptoms
- Leaves curl inward, sometimes tightly
- Leaf edges may also turn brown
- Can affect new growth or established leaves
- In Calathea and prayer plants, curling at night is normal — daytime curling is the issue
Most likely causes
- Underwatering or low humidity. The most common cause. The plant curls leaves to reduce surface area and water loss. Especially common in tropicals like Calathea and Bird of Paradise.
- Tap water sensitivity. Some plants react to fluoride and chlorine by curling. Calathea is the classic example.
- Pest damage. Spider mites and aphids feeding on leaves can cause distorted, curled growth.
How to fix
- Check the soil. Dry → water thoroughly. Curling typically reverses within 24 hours.
- Raise humidity above 50% with a humidifier or pebble tray.
- For sensitive plants, switch to filtered, distilled, or rainwater.
- Inspect leaf undersides for pests. Treat with insecticidal soap if found.
How to prevent next time
- Maintain consistent humidity above 50% for tropical plants
- Keep watering rhythm steady — no long dry spells
- Use room-temperature filtered water for sensitive species
Fading leaf pattern
Symptoms
- Calathea or other patterned leaves lose their distinct markings
- Patterns become muted, washed-out, or completely solid
- New growth may come in less patterned than older leaves
Most likely causes
- Too much direct sun. Direct sun bleaches the patterns of Calathea and prayer plants, which evolved on the rainforest floor under filtered light.
- Inconsistent humidity. Low or fluctuating humidity stresses these plants and can affect new leaf development.
How to fix
- Move the plant out of direct sun. Bright indirect or even medium light suits these species best.
- Maintain humidity above 50% with a humidifier or grouped plants.
- New leaves should emerge with restored patterns over 1–2 months.
How to prevent next time
- Never expose Calathea or prayer plants to direct sun
- Keep humidity high and consistent
Yellow leaves
Symptoms
- Older lower leaves turn yellow first, sometimes one at a time
- Yellowing spreads from the leaf base outward, or appears as patches
- Soil feels persistently wet, or has been bone-dry for several weeks
- Yellow leaves may feel soft (overwatering) or papery (underwatering)
Most likely causes
- Overwatering. The most common cause. Roots sit in waterlogged soil, lose oxygen, and start to rot. The plant cannot move water and nutrients up to the leaves, so they yellow and drop.
- Underwatering. If the soil is severely dry and pulled away from the pot edges, the plant is shedding leaves it can no longer support. Yellowing under drought is usually accompanied by crispy edges.
- Natural leaf drop. Older lower leaves yellow and fall as the plant matures. One yellow leaf every few months on an otherwise healthy plant is normal — not a problem.
How to fix
- Check the soil 5cm deep with your finger. Wet → underwater diagnosis. Dry past the second knuckle → underwater diagnosis.
- If overwatered, hold off watering and move to a brighter spot to speed soil drying. Tip the pot to drain any pooled water.
- If underwatered, soak the pot in a basin of room-temperature water for 20 minutes, then let drain.
- Remove yellow leaves only after the rest of the plant stabilises — they will not turn green again, but cutting them off too early stresses the plant further.
- If many leaves yellow within a week and stems feel mushy, unpot and inspect the roots for rot.
How to prevent next time
- Water by checking the soil, not by the calendar
- Use a pot with drainage holes — decorative pots without drainage are root rot waiting to happen
- Cut watering by 30–50% in winter when growth slows
Spider mites
Symptoms
- Fine webbing on the underside of leaves, especially where leaves meet stems
- Tiny pale or yellow stippling dots all over the leaves
- Leaves turn dusty-looking, then dry and drop
- Worsens fast in warm, dry conditions
Most likely causes
- Low humidity. Spider mites thrive in dry indoor air. Heated rooms in winter are their favourite environment.
- Hitchhiking on a new plant. A new plant from the nursery often brings mites home with it. They spread to other plants within days.
How to fix
- Isolate the affected plant immediately so mites do not spread.
- Take it to the shower or sink. Spray the entire plant — especially leaf undersides — with strong, lukewarm water for 2–3 minutes. This dislodges most mites.
- After drying, spray with insecticidal soap or a 1:10 mix of mild dish soap and water, covering both sides of every leaf. Repeat every 5–7 days for 3–4 weeks.
- Wipe down the pot and the area where the plant was kept — mites can hide there.
- Raise humidity around the plant. Mites cannot reproduce well above 50% humidity.
How to prevent next time
- Inspect new plants for two weeks before placing them near others
- Mist or use a humidifier in dry winter months
- Wipe leaves monthly with a damp cloth — disturbance prevents establishment