How to Grow Alocasia
Alocasia × amazonica
Alocasia is a dramatic tropical houseplant with large arrow-shaped leaves that thrives in high humidity and warmth above 15°C. It needs bright indirect light, consistently moist soil, and regular misting or a pebble tray to maintain humidity. It may die back in winter and regrow in spring — keep the tubers in slightly moist compost during dormancy. Not ideal for dry centrally-heated rooms without humidity support.
Yearly Lifecycle
Care Essentials
Feed monthly with a balanced liquid fertiliser during the active growing season from spring through summer. Do not feed in winter when the plant may become dormant.
Watch For
- Spider mites in dry air
- Mealybug
- Scale insects
- Root rot from waterlogged soil
- Leaf yellowing from cold or overwatering
Track your Alocasia care schedule — pruning, feeding, and seasonal tasks
Start planning freeCare Requirements
☀️ Light
Bright indirect light; no direct sun
Place near a bright window but out of direct rays, which scorch the large leaves. An east- or west-facing windowsill or a metre back from a south-facing window works well.
💧 Watering
Keep evenly moist; reduce in winter
Water when the top 2–3 cm of compost feels dry. Never let the pot sit in water. In winter, if the plant enters dormancy, reduce watering to just enough to keep the corm from desiccating.
🌱 Fertilizing
Monthly balanced feed during the growing season
Apply a balanced liquid fertiliser at half-strength monthly from spring through summer. Stop feeding completely in autumn and winter when growth slows or ceases.
✂️ Pruning
Remove dead or yellowing leaves at the base
Cut off any yellowed, damaged, or dying leaves cleanly at the petiole base. No structural pruning is needed — new leaves emerge from the central growing point.
🌿 Humidity
High humidity essential; above 60% ideal
Mist leaves daily, use a pebble tray with water beneath the pot, or run a humidifier nearby. Avoid placing near radiators or air vents which dry the air rapidly.
🌿 Temperature
Keep above 15°C year-round; no cold draughts
Alocasia dislikes temperatures below 15°C and will drop leaves if chilled. Keep away from cold windows in winter and never place on a cold floor or near an exterior door.
Growing Tips
Humidity is non-negotiable
Alocasia is a tropical plant and suffers in dry air. Mist leaves daily, place on a pebble tray filled with water, or use a humidifier nearby — especially in centrally heated rooms in winter.
Bright indirect light only
Direct sun scorches the large leaves quickly. A position a metre or two back from a south-facing window, or directly beside an east- or west-facing window, gives the right balance.
Warm roots, even moisture
Keep the root zone above 15°C and never let the pot sit in standing water. Water when the top 2–3 cm of soil feels dry, reducing significantly in winter if the plant enters dormancy.
Dormancy is normal, not death
In low winter light the plant may die back to the corm. Do not discard it — keep the pot in a warm spot, water sparingly, and new shoots will emerge as light levels improve in spring.
Pests & Diseases
Pest Spider Mites
Identification: Fine webbing on leaf undersides and between stems. Leaves develop a pale stippled or bronzed appearance. Mites are tiny and easier to spot by shaking a leaf over white paper.
- Increase humidity immediately — mites thrive in dry air
- Wipe leaves with a damp cloth, then spray with neem oil or insecticidal soap
- Bifenazate or abamectin-based miticide spray
Pest Mealybug
Identification: White cottony wax clusters in leaf axils, on stems, and at the base of petioles. Sticky honeydew and sooty mould may develop on affected areas.
- Dab individual bugs with a cotton swab dipped in isopropyl alcohol
- Apply neem oil or insecticidal soap spray weekly for several weeks
- Systemic insecticide containing imidacloprid as a soil drench
Pest Scale Insects
Identification: Brown or tan waxy bumps on stems and the undersides of leaves. Sticky residue on lower leaves and pot surface from honeydew secretions.
- Scrape off scales manually with a soft toothbrush or cloth
- Apply horticultural oil or neem oil spray in the crawler stage
- Systemic insecticide containing acetamiprid or thiacloprid
Disease Root Rot Pythium spp. / Phytophthora spp.
Symptoms: Yellowing leaves, wilting despite moist soil, and collapse of stems at the base. Roots are brown, soft, and smell unpleasant when removed from the pot.
Treatment: Remove plant from pot, cut away all affected roots, dust with sulphur powder or cinnamon, and repot into fresh well-draining compost. Reduce watering going forward.
Prevention: Always use a pot with drainage holes. Never let the pot sit in a saucer of water for more than an hour. Use a well-draining mix with added perlite.
Disease Bacterial Leaf Spot Xanthomonas spp.
Symptoms: Water-soaked spots on leaves that turn brown or black with yellow halos. Spots may run together to form larger necrotic patches. Affected areas may have a foul smell.
Treatment: Remove affected leaves immediately. Improve air circulation. Avoid wetting foliage when watering. Apply a copper-based bactericide if infection spreads.
Prevention: Water at the base of the plant, not overhead. Keep leaves dry. Avoid cold draughts and temperature fluctuations.
Log Alocasia in your garden — track growth, care, and harvests year after year
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