How to Grow Calathea
Calathea orbifolia
Calathea is prized for its beautifully patterned leaves that fold upward at night like hands in prayer. It needs bright indirect light — direct sun bleaches the markings — high humidity, and soft water; tap water fluoride causes brown leaf edges, so use rainwater or filtered water. Keep above 15°C and water with lukewarm water when the top of the soil feels moist but not wet. A rewarding plant for those who can meet its humidity needs.
Yearly Lifecycle
Care Essentials
Feed every 4 weeks from spring to early autumn with a half-strength balanced liquid fertiliser. Do not feed in winter when growth slows.
Watch For
- Spider mites in dry conditions
- Mealybugs at leaf bases and stems
- Brown leaf edges from low humidity or fluoride in tap water
- Root rot from waterlogging
Track your Calathea care schedule — pruning, feeding, and seasonal tasks
Start planning freeCare Requirements
☀️ Light
Bright indirect light; no direct sun
Place near a north or east-facing window, or at least 1 m back from a south-facing one. Direct sun bleaches the decorative markings within days and is the most common cause of faded foliage.
💧 Watering
Water when top 1–2 cm of compost is just moist
Use rainwater or filtered water at room temperature. Tap water fluoride causes brown leaf edges over time. Reduce frequency in winter but never let the rootball dry out completely.
🌱 Fertilizing
Half-strength balanced feed every 4 weeks, spring to early autumn
Feed monthly from April to September with a half-strength liquid fertiliser. Do not feed in winter — over-feeding causes salt build-up that damages roots and leaf edges.
✂️ Pruning
Remove dead or brown leaves at the base as needed
No structural pruning is required. Simply cut off any yellowed, damaged, or fully brown leaves at the base with clean scissors to keep the plant tidy and redirect energy to healthy growth.
🌿 Humidity
High humidity essential — aim for 60% or above
Stand the pot on a pebble tray filled with water (pot base above water level), group with other plants, or use a room humidifier. Misting provides only short-term relief and can promote fungal leaf spot if leaves stay wet.
Growing Tips
Use rainwater or filtered water only
Tap water fluoride is the most common cause of brown leaf edges in calathea. Collect rainwater or use a filter jug — even leaving tap water overnight doesn't remove fluoride.
Boost humidity actively
Misting alone is rarely enough. Place the pot on a pebble tray filled with water, or group plants together to create a humid microclimate around the foliage.
Bright indirect light — never direct sun
Position near a north or east-facing window, or set back from a south-facing one. Direct sun bleaches the intricate leaf markings within days.
Water with lukewarm water
Cold water shocks the roots and can cause leaf curling. Always use water at room temperature or slightly above, watering when the top centimetre of compost feels just moist.
Pests & Diseases
Pest Spider Mite
Identification: Fine webbing on leaf undersides and between stems; tiny pale dots on upper leaf surface caused by sap-sucking; leaves may look bronzed or stippled.
- Increase humidity immediately — spider mites thrive in dry air.
- Wipe leaves with a damp cloth and spray undersides with a dilute neem oil solution weekly.
- Apply a pyrethrin-based insecticide spray to all leaf surfaces, repeating every 7 days for 3 applications.
Pest Mealybug
Identification: White cottony wax clusters at leaf bases, stem joints, and undersides; sticky honeydew and sooty mould may follow.
- Dab individual colonies with a cotton bud dipped in rubbing alcohol (70% isopropyl).
- Apply neem oil spray to all surfaces every 10–14 days until clear.
- Use a systemic imidacloprid drench for persistent infestations.
Pest Fungus Gnats
Identification: Small dark flies hovering around the compost surface; larvae in the top 5 cm of compost feeding on roots and organic matter.
- Allow the top 3–4 cm of compost to dry out between waterings to interrupt the larvae's lifecycle.
- Apply Bacillus thuringiensis var. israelensis (Bti) as a soil drench.
- Drench compost with a diflubenzuron-based larvicide.
Disease Root Rot Pythium spp. / Phytophthora spp.
Symptoms: Wilting despite moist compost; yellowing leaves that don't recover after watering; brown, mushy roots with no firm white tips when the rootball is inspected.
Treatment: Remove from pot immediately, cut away all brown soft roots with sterile scissors, dust cuts with sulphur powder, and repot into fresh well-draining compost. Do not water for 7–10 days.
Prevention: Never let the pot sit in standing water. Use a free-draining houseplant or peat-free compost with added perlite. Water only when the top 1–2 cm of compost is dry.
Disease Fungal Leaf Spot Helminthosporium spp.
Symptoms: Brown or tan circular spots with a darker border on the leaves, sometimes with a yellow halo; spots may merge and cause larger areas of dieback.
Treatment: Remove affected leaves promptly. Improve airflow and reduce leaf wetness. Apply a copper-based fungicide if spreading.
Prevention: Avoid wetting the foliage when watering; water at the base. Ensure good air circulation around the plant.
Log Calathea in your garden — track growth, care, and harvests year after year
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