Plant care guide
Alocasia Overwatering: Signs, Thirst Check and Fixes
Updated
Is my Alocasia overwatered?
An overwatered Alocasia yellows or droops while the top 5 cm (2 in) of its mix is still damp, often in autumn or winter when growth slows. The RHS says to water only once that top layer is dry in the growing season, and to cut watering to a minimum while the plant rests. Alocasias want humid air, not a wet pot.
What to do first
Stop watering and empty the saucer. Wait until the top 5 cm (2 in) of mix is dry before watering again, and water very little in winter. Raise humidity with a pebble tray instead of extra watering. If yellowing spreads in wet mix or the stems soften at the base, check the roots.
Alocasias look like plants that want lots of water: big leaves, jungle origins, a love of humidity. That is exactly why they get overwatered. The RHS Alocasia growing guide warns that overwatering, especially while the plant is dormant, can rot the roots. This page covers the stage before that, when the pot is too wet but the roots and stems are still firm. If the base is already soft, go to our Alocasia root rot guide.
How much water an Alocasia needs
- April to October. The RHS says to water as needed once the top 5 cm (2 in) of compost has dried.
- Winter. The RHS says to give cooler, drier conditions and reduce watering to a minimum while the plant rests. NC State Extension’s Alocasia profile also says to reduce watering in winter.
- The mix. NC State describes moist, well-drained, humus-rich soil. The RHS suggests three parts peat-free compost to one part horticultural grit for drainage.
- Humidity is separate. The RHS recommends medium to high humidity, using a tray of damp gravel, misting or a humidifier. Watering the pot more often does not raise air humidity. It only keeps the roots wet.
Is it overwatering?
NC State says yellowing Alocasia leaves can come from overwatering, too little water or too little light. So check the mix and the season first. Push a finger 5 cm (2 in) down, as University of Maryland Extension’s watering guide suggests, or lift the pot to judge its weight.
| What you see | Mix 5 cm (2 in) down | Likely cause |
|---|---|---|
| Yellowing leaves, heavy pot, water in the cachepot | Damp | Overwatering |
| Drooping in wet mix, fungus gnats, rotten smell | Damp | Overwatering, roots short of air |
| Drooping, pot light, mix dry quickly after watering | Dry | Thirst, or a pot-bound plant |
| Leaves dying back in late autumn, little new growth | Fairly dry | Winter rest |
| Slow growth and yellowing in a dim room | Any | Too little light |
| Pale, speckled leaves, fine webbing underneath | Any | Spider mites |
Virginia Cooperative Extension’s watering guide (SPES-804) lists the overwatered signs: wilting, yellowing on new and old leaves, mushy leaves and stems, rotten-smelling mix and fungus gnats.
The RHS adds a useful clue for thirst. If the compost dries out very fast after watering, the plant is usually pot-bound. NC State notes Alocasias are prone to spider mites, so check leaf undersides too.
The RHS says winter leaf loss is nothing to worry about. A resting Alocasia should be kept drier, not watered back to life. Our dormancy guide explains how to bring it back in spring.
What to do now
- Stop watering and empty any saucer or decorative pot.
- Check the drainage hole. SPES-804 lists clearing blocked holes and letting the mix dry as the first fixes for overwatering.
- Wait for the top 5 cm (2 in) to dry before watering again. In winter, keep watering to a minimum, as the RHS advises.
- Keep it warm. The RHS says to keep Alocasias above 16 °C (60 °F) in the growing season and above 10 °C (50 °F) in winter. Cold, wet mix dries very slowly.
- Give it bright, indirect light. The RHS says growth is much slower in low light, and a slow plant uses less water.
- Move humidity off the pot. Stand the plant on a tray of damp gravel with the water below the pot base, as the RHS describes.
- Hold off on feeding outside the April to October season, as the RHS advises.
When to look at the roots
Unpot the plant if the mix stays wet for many days, yellowing spreads to new leaves, or a stem softens near the soil. Clemson HGIC’s disorders factsheet explains that overwatering cuts the oxygen available to roots and favors root disease. Roots that are brown to black and soft mean rot. Wear gloves, because the RHS notes the sap can irritate skin. Then follow the Alocasia root rot guide.
When you repot, the RHS advises a pot only about 5 cm (2 in) wider than the old one, to avoid overpotting problems.
Keep it from coming back
Water by the mix and the season, never on a fixed schedule. Our watering guide covers technique, and our root rot guide explains how rot takes hold. For brown patches on leaves, see Alocasia brown spots.
References
How this guide was put together: RHS, NC State Extension, Virginia Cooperative Extension, University of Maryland Extension and Clemson HGIC guidance.