Alocasia Care Guide

Alocasia are some of the most striking houseplants you can grow. Bold, architectural leaves on slender stems that immediately draw the eye. They're native to tropical and subtropical forests across Southeast Asia, where they grow on the forest floor in warm, humid conditions with dappled light. Getting those conditions roughly right indoors is the key to keeping them happy.

This guide covers everything you need to know about Alocasia care: lighting, watering, humidity, soil, fertilising, propagation, dormancy, and troubleshooting the most common problems. We grow and propagate dozens of Alocasia varieties in our nursery, so this advice comes from hands-on experience, not just theory.

Note: Alocasia contain calcium oxalate crystals and are toxic to cats, dogs, and humans if ingested. Keep them out of reach of pets and small children.

Light

Alocasia need bright, indirect light. In their natural habitat, they grow beneath a canopy, so they're adapted to strong ambient light without direct sun hitting the leaves. A spot near an east-facing or west-facing window is ideal in most UK homes. South-facing windows work too, provided the plant is set back a metre or so, or shielded by a sheer curtain during midday.

Direct afternoon sun will scorch the leaves. You'll see crispy brown patches where the light hits. On the other hand, low light is one of the most common reasons Alocasia struggle indoors. North-facing rooms or positions well away from windows often don't provide enough light, and you'll notice the plant producing smaller leaves, leggier stems, or dropping older leaves to conserve energy.

If your space is on the darker side, a grow light can make a real difference. Even a basic LED bulb running 10–12 hours a day will give an Alocasia what it needs through the shorter days of autumn and winter.

Watering

Alocasia like their soil to be consistently moist but never waterlogged. That's the balance to strike, and it's the area where most people go wrong, usually by overwatering.

The simplest approach: push your finger into the top 2–3 cm of soil. If it feels dry, water thoroughly until it drains from the bottom. If it's still damp, wait. In summer, this typically means watering every 5–7 days; in winter, more like every 10–14 days, depending on your home's temperature and heating.

Alocasia are particularly prone to root rot if they sit in soggy compost, so make sure your pot has drainage holes and never leave water sitting in the saucer. Bottom watering (placing the pot in a tray of water for 20–30 minutes then removing) is a good alternative, but not essential, that lets the roots draw up what they need without saturating the top layer.

Use room-temperature water where possible. Cold water straight from the tap can shock the roots, especially in winter.

Humidity & Temperature

This is where Alocasia can be demanding. They're tropical plants and prefer humidity above 50–60% and temperatures between 16–30°C. Most UK homes sit around 40–50% humidity, which is tolerable but not ideal. It drops further in winter when the heating is on.

How to increase humidity:

• Pebble tray: Place the pot on a tray of wet pebbles. As the water evaporates, it raises humidity around the plant. Top up regularly.
• Group your plants: Clustering several plants together creates a microclimate of shared transpiration.
• Humidifier: The most effective option, particularly for a dedicated plant shelf or cabinet. A cool-mist humidifier running nearby makes a noticeable difference.

Temperature-wise, keep Alocasia away from cold draughts, open windows in winter, and radiators. Sudden temperature swings, such as a plant on a windowsill that gets cold overnight, are a common cause of leaf drop. Below 15°C, most Alocasia will go dormant (see the Dormancy section below).

Soil & Repotting

Alocasia need a well-draining, airy potting mix that holds some moisture without becoming compacted or waterlogged. A standard peat-based houseplant compost on its own is usually too heavy and moisture-retentive.

We recommend a mix of roughly: 40% peat-free houseplant compost, 30% perlite or pumice, 20% orchid bark, and 10% worm castings or coco coir. This gives you the drainage and aeration that Alocasia roots need while still holding enough moisture. Our Alocasia Potting Mix is formulated along similar lines if you'd rather not mix your own.

Alternatively, Alocasia grow well in semi-hydroponic setups using LECA. This inorganic substrate eliminates the risk of root rot and fungus gnats entirely, though they require a slightly different watering and feeding approach.

Repotting: Repot in spring when you see roots circling the bottom of the pot or emerging from drainage holes. Go up one pot size only (e.g. 12 cm to 14 cm). Alocasia don't like being overpotted. Too much soil around the roots holds excess moisture.

Fertiliser

Feed Alocasia with a balanced liquid houseplant fertiliser at half-strength, every two weeks during the growing season (April–September). They're not heavy feeders, but consistent light feeding supports those large, energy-intensive leaves.

Stop feeding entirely from October to March if you see growth stop. During dormancy or reduced growth, the plant can't use the nutrients, and they'll build up as salt deposits in the soil. This can cause brown, crispy leaf edges. If your plant continues to grow, continue to feed no matter what time of the year it is.

If you notice white crusty deposits on the soil surface, that's likely fertiliser salt buildup. Flush the soil by watering thoroughly with plain water until it runs freely from the bottom.

Dormancy

Many Alocasia go through a natural dormancy period in autumn and winter. This catches a lot of people off guard. The plant drops its leaves, appears to die, and gets thrown away. But it's completely normal behaviour for a tropical plant adapting to shorter days and cooler temperatures.

What dormancy looks like: The plant stops producing new leaves. Existing leaves yellow and drop one by one. Eventually, you may be left with just the corm (the bulbous base) sitting in the soil with no visible growth above the surface.

What to do: Reduce watering to a bare minimum, just enough to keep the corm from desiccating completely. Stop fertilising. Keep the pot somewhere warm (above 15°C if possible) and away from draughts. Don't repot, don't move it around, and resist the urge to dig up the corm to check on it.

When spring arrives and temperatures rise, the corm will send up new growth. Resume normal watering and feeding once you see a new shoot emerging. The first leaves after dormancy are often smaller than pre-dormancy growth. That's normal, and they'll get larger as the plant re-establishes.

Not all Alocasia go fully dormant indoors, especially if your home stays warm and well-lit through winter. Some just slow down noticeably rather than dropping all their leaves.

Propagation

Alocasia are propagated by division or from corms (small bulb-like offsets that form at the base of the mother plant).

Division

The easiest method. When repotting in spring, you'll often find that the mother plant has produced offsets: smaller plants growing alongside it with their own root systems. Gently separate these from the main plant, ensuring each division has its own roots, and pot into fresh, well-draining mix. Water lightly and keep in a warm, humid spot until established.

Corm Propagation

When you unpot an Alocasia, look for small round corms (like miniature bulbs, usually 1–2 cm across) attached to the root system or loose in the soil. These can be grown into new plants:

1. Remove corms from the parent plant and brush off excess soil.
2. Place them on top of damp sphagnum moss or perlite in a small pot or propagation tray.
3. Cover with a clear lid or plastic bag to maintain high humidity.
4. Keep warm (20–25°C) in bright, indirect light.
5. Mist regularly to keep the moss damp but not sodden.
6. A shoot should appear within 4–8 weeks. Once it has a leaf and visible roots, pot into a small container with standard Alocasia soil mix.

Spring and early summer are the best times to propagate. Avoid propagating during dormancy; the corms are far less likely to activate.

Popular Alocasia Varieties

There are over 80 recognised Alocasia species, plus numerous hybrids and cultivars. Here are some of the most popular varieties we grow and sell, with notes on how their care differs from the general advice above.

Alocasia Polly (Alocasia × amazonica 'Polly')

The most commonly sold Alocasia. Compact, with dark green arrow-shaped leaves and striking white veins. Polly is on the smaller side (30–45 cm) and does well in slightly lower light than other varieties. It's also one of the more prone to dormancy in winter, so don't panic if it drops all its leaves. Keep the corm warm and it'll come back.

Alocasia Zebrina

Known for its distinctive striped, zebra-patterned stems. The leaves are more rounded and shield-shaped than Polly's. Zebrina tends to grow taller (up to 90 cm indoors) and is slightly more demanding about humidity. It's a good one for a bathroom with a bright window. See our Alocasia collection for current availability.

Alocasia Dragon Scale (Alocasia baginda 'Dragon Scale')

Textured, silvery-green leaves with deeply etched veins. It genuinely looks like dragon skin. Dragon Scale is more compact and prefers slightly less water than other Alocasia. Let the soil dry out a bit more between waterings, and it does well in LECA. It's also more tolerant of lower humidity than varieties like Zebrina.

Alocasia Frydek (Alocasia micholitziana 'Frydek')

Dark, velvety green leaves with bright white veins. Frydek is sometimes confused with Polly but has a softer, more matte leaf texture. It appreciates slightly higher humidity (60%+) and is a beautiful choice for a plant cabinet or terrarium setup.

Alocasia Silver Dragon (Alocasia baginda 'Silver Dragon')

A smaller variety with thick, almost metallic silver-green leaves and prominent dark veining. Silver Dragon stays compact (20–30 cm) and is well-suited to terrariums. It's a slow grower and doesn't need as much fertiliser as the larger varieties.

Common Problems & Troubleshooting

Yellowing Leaves

The most common complaint. In Alocasia, yellowing is usually caused by overwatering. Check whether the soil is staying too wet and adjust your watering schedule. It can also signal insufficient light, especially if older (lower) leaves yellow while new growth looks healthy. Some leaf yellowing is natural as the plant drops older leaves to put energy into new ones. One yellow leaf isn't cause for alarm, but several at once usually mean a care issue.

Brown, Crispy Leaf Tips and Edges

Almost always a humidity problem. If the air is too dry, leaf edges and tips dry out and turn brown and papery. Increase humidity using the methods above. It can also be caused by fertiliser salt buildup or watering with very hard water.

Drooping Leaves

Alocasia leaves droop when the plant is thirsty. Check the soil and water if it's dry. But drooping can also mean the opposite: overwatering and early root rot. Feel the soil. If it's damp and the leaves are drooping, stop watering, check the roots for mushiness, and let the pot dry out. Cold draughts can also cause a sudden droop.

Leaf Drop

If your Alocasia is dropping leaves in autumn or winter, it's likely going dormant. See the Dormancy section. Outside of dormancy, leaf drop is usually stress-related: a sudden change in conditions (repotting, moving, temperature shift) or sustained poor watering. Alocasia are sensitive to change and often drop a leaf or two after being moved.

Small or Pale New Leaves

New leaves that are significantly smaller, paler, or thinner than established growth usually indicate insufficient light. Move the plant to a brighter spot. It can also mean the plant is underfed. If you haven't fertilised during the growing season, that may be the cause.

Pests

Alocasia are particularly susceptible to spider mites (tiny speckled dots on the undersides of leaves, often with fine webbing) and fungus gnats (small black flies hovering near the soil, usually from overwatering). For spider mites, wipe leaves regularly with a damp cloth and treat with neem oil. For fungus gnats, let the soil dry out more between waterings and use yellow sticky traps.

Related Reading

• Shop Alocasia: browse our current collection
• Fungus Gnats Guide: identification and treatment
• Shop Potting Mixes
• Shop LECA