Plant Care Guide — Alocasia — The Planters' Guild

Origin & History

One rhythm across the genus. Alocasia is a genus of roughly ninety aroids native to tropical and subtropical Asia, from India and southern China through Southeast Asia to New Guinea and northern Australia (Plants of the World Online, n.d.). They grow from a fleshy corm or rhizome, a swollen underground stem that stores energy, and push up large arrow- or shield-shaped leaves on tall stalks.

Because they evolved to warm, humid forest floors and clearings, the whole genus wants the same things indoors: bright indirect light, steady warmth, a chunky mix that drains fast, and humidity most homes have to raise on purpose. Give them that and they grow quickly through the warm months.

What differs between species is mostly the leaf: glossy and green, deeply lobed, veined silver, or thick and velvet. Those differences, and the few that change care, live on the species cards in this guide.

Native range of the genus Alocasia: tropical Asia east to New Guinea and northern Australia. Source: POWO (n.d.).

Care in Depth

Light & warmth. Bright, indirect light is the target; direct midday sun scorches most Alocasia, and deep shade stalls them. Keep them warm, roughly 65 to 80°F (18–27°C), above about 60°F (16°C) while growing and never below 50°F (10°C). They dislike cold drafts and sudden chills.

Water & humidity. Through the growing season, water when the top inch or two of mix is dry, then let the excess drain; the roots rot in soggy mix. Humidity is where most people come unstuck: Alocasia want it high, ideally 60 percent or more, and dry air brings brown, crisp edges and invites spider mites. A humidifier does more than misting.

Substrate & nutrients. Pot in a chunky, airy aroid mix built on bark and perlite so water runs through quickly. Feed a balanced fertilizer at half strength through spring and summer, and stop once growth slows for the year.

The winter rest. As light and warmth drop, many Alocasia slow and drop their leaves to a bare corm. This is dormancy, not the end. Keep the pot warm, water just enough that the mix does not go bone dry, and hold off feeding. Fresh leaves return in spring; give a bare corm a full season before writing it off.

A winter rest is normal, not the end

As light and warmth drop, many Alocasia slow down and drop their leaves entirely, right back to a bare corm. This is dormancy, not the end. Move the pot somewhere warm, cut watering back to just enough to keep the mix from going bone dry, and hold off feeding. Fresh leaves push up again when light and warmth return in spring.

Common Problems & Pests

What you see	Likely cause	What to do
Fine webbing, pale stippling	Spider mites (dry air)	Rinse; raise humidity; insecticidal soap.
Brown, crisp leaf edges	Low humidity	Raise humidity; a humidifier beats misting.
Yellowing, then leaf drop in winter	Onset of dormancy	Normal; cut water back, keep the corm warm.
Yellowing with a soft, mushy base	Overwatering or rot	Let it dry; chunkier mix; check the corm.
Drooping despite moist soil	Cold or root stress	Warm it up; ease off water; check drainage.
Pale, leggy new growth	Too little light	Move to brighter, indirect light.

Care at a Glance

Origin & History

Care in Depth

Common Problems & Pests