I killed three calatheas before I figured it out. The fourth one has been alive for two years and is genuinely thriving. Here's what changed: I bought a small humidifier and switched to filtered water. That's it. Those two things solved 90% of my calathea plant problems. Everything else I was already doing right. If you're struggling with calathea, start there before anything else.
What Is a Calathea?
Calathea is a genus of tropical plants from South America — though many species have now been reclassified under Goeppertia. They're famous for their striking patterned leaves and their nyctinasty — the leaves fold upward at night as if praying, and unfold during the day.
- Scientific name: Calathea spp. / Goeppertia spp. (reclassified)
- Common names: Calathea, prayer plant (shared with Maranta), peacock plant, zebra plant
- Origin: Tropical Americas, primarily Brazil
- Indoor height: 30–100cm depending on variety
- Toxicity: Non-toxic to cats, dogs, and humans — one of the few safe choices
- Difficulty: High — not recommended as a first plant
Calathea Care at a Glance
Every item in this table matters more than usual with calathea — it's a plant that notices when you compromise on any of these.
| Care Aspect | Requirement | My Tip |
|---|---|---|
| Light | Medium to low indirect light | No direct sun — leaves bleach and curl within days |
| Watering | Every 7–10 days; keep soil consistently moist | Never let it dry completely like a succulent |
| Water type | Filtered, rainwater, or tap left overnight | This is non-negotiable — fluoride destroys the leaves |
| Soil | Moisture-retaining, well-draining mix | Coir-based mix with perlite works well |
| Humidity | 60%+ at all times | Small humidifier nearby is the most effective solution |
| Temperature | 18–29°C; never below 15°C | Cold draughts cause instant leaf curl |
| Fertiliser | Monthly (spring–summer); half strength | Skip in winter — overfeeding causes leaf tip burn |
| Repotting | Every 1–2 years in spring | Slight root binding is fine; don't over-pot |
Why Calathea Leaves Curl (And How to Fix It)
Curling is calathea's main distress signal. Here's what each type of curling usually means:
- Leaves curling inward along the length: Low humidity or underwatering. Increase humidity first, then check soil moisture.
- Leaves curling under from the edges: Usually a combination of low humidity and cold. Move away from draughty windows.
- New leaves emerging curled and staying curled: Root rot or severe underwatering. Check roots and adjust watering.
- Evening curl: Normal nyctinasty — the plant is closing for the night. Not a problem at all.
In my experience, a small humidifier (£25–35) is the single best investment for calathea. Pebble trays help but don't raise humidity enough in dry centrally-heated rooms. A humidifier set to 65% humidity solved my curling problem permanently.
Best Calathea Varieties to Grow
- Calathea ornata — dark green with pink/white pinstripes. Stunning. My personal favourite.
- Calathea medallion — large round leaves with green/burgundy pattern. Tolerates lower humidity better than most.
- Calathea zebrina — light and dark green striped pattern. Very bold, slightly easier than ornata.
- Calathea lancifolia (Rattlesnake plant) — wavy edges, spotted pattern. One of the most forgiving varieties.
- Calathea musaica (Network) — intricate mosaic pattern. Slightly more tolerant of dry air.
If you're new to calathea, start with Medallion or Rattlesnake — they tolerate slightly lower humidity and are more forgiving of inconsistent watering.
Common Calathea Problems & Fixes
- Brown crispy leaf edges: Tap water (fluoride), low humidity, or both. Switch to filtered water and add a humidifier.
- Yellow leaves: Overwatering. The soil should be moist, not soggy. Check drainage.
- Fading leaf pattern: Too much direct light. Move to a shadier spot.
- Limp, drooping leaves: Underwatering or root rot. Check soil — if dry, water thoroughly; if soggy, repot.
- Brown spots in leaf centre: Fungal issue or cold damage. Improve air circulation, remove affected leaves.
- Pests: Spider mites are the main enemy, especially in dry air. Increase humidity and treat with neem oil spray.
Frequently Asked Questions
Curling leaves are the calathea's response to low humidity, inconsistent watering, or cold draughts. Check humidity first — it needs 60%+ to be comfortable. If that's fine, check if the soil has dried out too much or if there's a cold draught nearby. Evening curling is completely normal — that's just nyctinasty.
Use filtered water, rainwater, or tap water left to sit overnight (to allow chlorine to evaporate). Calatheas are extremely sensitive to fluoride and chlorine — these cause brown tips and crispy edges regardless of everything else you do right. This single change fixed most of my calathea problems.
Every 7–10 days in summer, every 10–14 days in winter. Keep the soil consistently moist but never waterlogged. The top inch should feel barely damp before you water again — not completely dry like with succulents. Calathea does not tolerate drying out.
Calathea and prayer plant (Maranta) are closely related and both nyctinastic — their leaves move up at night and flatten during the day. They're different genera but have similar care needs and are often confused. Calathea is now reclassified as Goeppertia by some botanists, which adds to the confusion.
Brown edges and tips are almost always caused by low humidity or tap water with fluoride/chlorine. Switch to filtered water and increase humidity to 60%+ with a humidifier or pebble tray. Brown spots in the centre of leaves may indicate fungal infection from poor air circulation or overwatering.
Final Thoughts on Calathea
Calathea is not the plant for beginners. But if you've got the basics down and you want something genuinely spectacular — something that moves with the light and has leaves like living art — it's worth the effort. A humidifier and filtered water. That's the secret. Everything else is standard houseplant care. If you want a stunning plant with lower maintenance, monstera gives similar tropical drama with significantly less fuss.