Alocasia: lower leaves turning yellow

What it is likely to be on alocasia

1. Seasonal dieback

   May be normalcommon on this plant

   ·source

   Sourced guidancemoderate confidence

   • Royal Horticultural Society: Houseplants — seasonal care

   Checked 2026-08-13

   A herbaceous perennial collapsing to nothing in autumn, or a seasonally dormant houseplant dropping most of its leaves in winter. The plant is intact underground and the top growth is expendable — an alocasia that has shed every leaf but has a firm corm is dormant, not dead, and is most often killed afterwards by being watered as though it were still growing.

   Points towards it

   • · dormancy takes the whole plant down together, because the corm is withdrawing from all of it at once
   • · it arrives with the autumn rather than after anything was done, and a cool room brings it on sooner
   • · an indoor plant responding to a British winter

   Argues against it

   • · one leaf yellowing on a plant still holding the rest is ordinary turnover rather than dormancy — this rules it out entirely.
   • · a recent repot explains a general collapse better than the season does, and alocasia resents root disturbance

   Check this next

   Ignore the leaves entirely and dig a finger down to the corm. An alocasia that has yellowed and dropped everything but whose corm is firm and heavy under the compost is asleep, not dead, and will send up a new leaf in spring — a corm that is soft or gives under a fingernail has rotted, and that is the only version of this worth acting on.

   What to do now

   Move it somewhere cool but frost-free and stop watering almost completely — a splash once a month is enough to keep the corm from desiccating. Do not feed it and do not repot it now; start watering again only when a new shoot appears, which is usually somewhere between February and April.

   ·source

   Sourced guidancemoderate confidence

   • Royal Horticultural Society: Houseplants — seasonal care

   Checked 2026-08-13

2. Overwatering

   Candidate 2very common on this plant

   ·source

   Sourced guidancemoderate confidence

   • Royal Horticultural Society: Alocasia — problems

   Checked 2026-08-13

   Not a matter of volume but of frequency: roots need air as well as water, and compost that never dries suffocates them. It kills more houseplants than every pest and disease combined, and its cruellest feature is that the early signs — yellowing, wilting, dropping leaves — look exactly like drought, so the instinct is to water more.

   Points towards it

   • · an alocasia corm sits in compost that must never be sodden, and a wet pot in a cool room rots it within weeks
   • · an overpotted alocasia has more wet compost than roots, which is the standard way this starts
   • · this is a container diagnosis

   Argues against it

   • · dry compost rules out waterlogging, and a dry alocasia droops rather than yellows — this rules it out entirely.

   Check this next

   Push a finger deep into the compost and lift the pot. Wet compost a week after watering, and a pot that still feels heavy, with yellowing that is spreading up the plant in summer rather than in winter, is water rather than dormancy — and the confirmation is under the surface, where a rotting corm is soft and smells sour instead of firm and clean.

   What to do now

   Let the top half of the compost dry out before watering again, move it somewhere warmer and brighter, and if the corm is soft, cut away the rotten tissue and repot the firm remainder into a pot only just large enough, in an open, bark-rich mix. Alocasia wants moisture and warmth together — wet and cool is the combination that kills it.

   ·source

   Sourced guidancemoderate confidence

   • Royal Horticultural Society: Alocasia — cultivation

   Checked 2026-08-13

Narrow it down

This page lists everything at once, which is the right shape for reading and the wrong shape for deciding. The interactive tool asks one question at a time, starting with whichever would separate these causes fastest, and stops as soon as further answers would not help.

Opens with the plant and the symptom already set. Nothing you answer is stored or sent anywhere — the answers live in the address bar and nowhere else.

What this does not cover

These are the causes GrowingHQ holds rules for on alocasia — not every cause there is. Where several problems look alike, the honest answer is often that they cannot be told apart by eye, and a page that named one would be guessing. If none of the above fits, the general lower leaves turning yellow page lists causes across all plants, and the Alocasia profile lists the problems it is prone to.