Alocasia Care: Light, Water, Humidity and Dormancy

Alocasia care comes down to warmth, light and consistency: give your elephant ear bright, indirect light, keep the soil evenly moist (water when the top 3 to 5 cm is dry), use a very airy mix, keep humidity above 50% and temperatures above about 18°C. In winter, cut back on water. If it drops leaves or dies back to a bulb-like corm, that's often dormancy, not death.

Alocasias are tropical aroids from South-East Asia and eastern Australia, grown for their dramatic, arrow-shaped leaves. Popular types include 'Polly' (Alocasia × amazonica), 'Zebrina' with striped stems, 'Regal Shield', 'Black Velvet', 'Frydek' and 'Silver Dragon'. They grow from corms or rhizomes, which explains much of their behaviour: fast growth in warm, bright conditions, and a tendency to rest when it's cool and dark.

Alocasia care at a glance

Popular alocasias

Light

Alocasias need bright, indirect light to keep producing new leaves. An east window, a bright north window, or a spot a little back from a south or west window works well. Some gentle morning sun is fine; hot afternoon sun burns the leaves. In low light, growth stops, leaves droop on long weak stems and the plant is more likely to go dormant. Grow lights help a lot in winter. Check with the plant light meter converter.

Watering

Alocasias like evenly moist soil in the growing season but rot quickly when waterlogged.

1. Check the top 3 to 5 cm of soil. Water when it's dry.
2. Water thoroughly and let it drain.
3. Empty the saucer.

In summer that's often every five to nine days. Drooping with dry soil means thirst. Yellowing with damp soil means too much. In winter, if the plant slows or goes dormant, water just enough to stop the mix drying out completely, maybe every two to three weeks. See the watering schedule tool and overwatered plant signs.

Soil and pots

Use a very airy mix: equal parts orchid bark, perlite and peat-free houseplant compost, with a handful of coco chips or pumice. Alocasias like snug pots; a pot that's too large stays wet and causes rot. Some growers use semi-hydro (LECA or pon) for these plants. The soil mix calculator helps with chunky mixes.

Humidity and temperature

Aim for 50 to 70% humidity. Dry air causes brown edges and invites spider mites, the number-one pest on alocasias. A humidifier is worth it. Keep plants warm, ideally above 18°C, and away from cold drafts and windows. A drop below about 15°C often triggers leaf loss.

Feeding

Alocasias grow fast in summer and are hungry. Feed every two to four weeks with a balanced liquid fertiliser during active growth. Don't feed a dormant or struggling plant. Use the fertilizer dilution calculator.

The one-in, one-out habit

Healthy alocasias often keep only three to five leaves at a time. When a new leaf opens, the oldest one often yellows and dies. That's normal. Cut off the yellow leaf at the base once it's mostly yellow.

Winter dormancy

When light and temperatures drop, many alocasias slow down and may lose all their leaves, retreating to their corm.

What to do:

1. Don't throw it away. Check the corm: it should be firm, not mushy.
2. Keep it in a warm spot (above 18°C if possible).
3. Water sparingly, just enough to keep the soil from drying out completely.
4. Don't feed.
5. When days lengthen in spring, new shoots usually appear. Resume normal watering when you see growth.

You can prevent or reduce dormancy by keeping the plant warm, under a grow light and in high humidity through winter.

Propagation by corms and division

Alocasias produce small corms (bulb-like offsets) in the soil, especially when repotted.

1. Collect corms at repotting time.
2. Peel the brown outer skin if you like, to speed things up.
3. Place corms half-buried in damp sphagnum moss or perlite in a clear container with a lid.
4. Keep warm (22–27°C) and bright.
5. Roots and a shoot appear in weeks to a few months.

Larger plants with several stems can also be divided at repotting. See how to propagate houseplants.

Repotting

Repot in spring or early summer, when the plant is actively growing, only if it's root-bound. Go up just one size. Repotting during dormancy often leads to rot.

Common alocasia problems

Bringing a new alocasia home

Alocasias often struggle in the first few weeks after purchase. They've usually been grown in warm, humid greenhouses, then shipped and kept in shops with less light. Expect one or two leaves to yellow. To help:

• Put it straight into its brightest permanent spot, out of hot sun.
• Keep it warm, ideally above 20°C, and away from drafts.
• Check for spider mites on arrival; they often come with the plant.
• Don't repot for the first month unless the soil is waterlogged.
• Water only when the top few centimetres are dry; nursery soil is often dense and holds water.

Once it pushes out a new leaf in your home, it has settled in.

Alocasia vs colocasia vs xanthosoma

All three are called "elephant ears". Alocasia leaves usually point upward or outward with the stalk attached at the notch. Colocasia leaves point downward with the stalk attached inside the leaf. Xanthosoma has a stalk attached at the notch and often a vein around the leaf edge. Colocasia grows best outdoors or in very wet conditions; alocasia is the most common indoors.

Alocasia care checklist

• ☐ Bright, indirect light
• ☐ Water when top 3–5 cm is dry; less in winter
• ☐ Very airy mix in a snug pot
• ☐ Humidity 50%+
• ☐ Keep above 18°C
• ☐ Feed every 2–4 weeks in growth
• ☐ Check for spider mites weekly
• ☐ Don't panic at winter dormancy

Sources and further reading

• Royal Horticultural Society: Alocasia, for light, humidity and temperatures.
• University of Florida IFAS Extension: Alocasia, for species and corm propagation.
• ASPCA Toxic and Non-Toxic Plants list, for pet safety.