Fertilising guide
How to fertilise Giant Taro (Alocasia macrorrhizos)— schedule & NPK
Also called Giant Elephant Ear, Upright Elephant Ear.
More about giant taro
About Giant Taro
Alocasia macrorrhizos · also called Giant Elephant Ear, Upright Elephant Ear · tropical
Giant Taro is a massive upright Alocasia with glossy, arrow-shaped leaves held skyward on stout stems, reaching several metres in the tropics. It makes a bold architectural statement indoors and out. A fast, hungry, thirsty aroid, it loves warmth, rich soil and high humidity, and demands far more water than most houseplant Alocasias.
Growth habit: Evergreen rhizomatous upright herbaceous perennial; forms a thick above-ground stem (caudex) over time, holding huge leaves vertically rather than drooping, hence 'upright elephant ear'.
What fertiliser giant taro actually wants — and why
Giant Taro is a genuinely hungry tropical — in bright warmth it pushes growth fast and rewards a regular half-strength balanced feed all season.
A balanced liquid feed (even N-P-K) or a slightly nitrogen-leaning foliage feed — this is a big-leaved foliage plant putting on real size, so it wants steady nitrogen for lush leaves, not a bloom formula.
For the language behind the three numbers on the bottle — what nitrogen, phosphorus and potassium each do — see the NPK ratio explained entry. The short version for giant taro: match the feed to the job the plant is doing right now, not to a generic “plant food” on the shelf.
How often to feed giant taro, and which months
Feeding only earns its keep while the plant is in active growth and can use the nutrients — pour feed into a dormant or low-light plant and it simply builds up as root-burning salt. For giant taro:
A heavy feeder: feed every two to four weeks through spring and summer with a balanced liquid fertiliser at full or half strength to fuel its fast, large growth. Reduce or stop feeding in autumn and winter. Adequate feeding is key to producing its full-sized leaves. For a fast grower like this that means feeding regularly — about sparingly through the growing season — right through spring through early autumn (roughly March to September), tapering off only as light drops in autumn.
The dormant-season rule matters more than the exact interval: skip feeding entirely when giant taro is resting. For the wider context on indoor feeding rhythms across the seasons, the houseplant fertiliser schedule walks through the year month by month.
What strength to mix for giant taro
Half strength every feed is the sweet spot for giant taro: frequent enough to fuel fast growth, dilute enough that it never scorches even when you feed often.
Feeding always goes onto already-damp soil, never dry roots — water giant taro first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the giant taro watering schedule.
Signs you are over-feeding giant taro
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for giant taro:
- Brown, scorched leaf tips and margins despite correct watering.
- A white salt crust on the soil or around the pot edge.
- Sudden leaf yellowing and drop shortly after a strong feed.
- Soft, weak, over-stretched growth that cannot support itself.
Signs you are under-feeding giant taro
- New leaves coming in noticeably smaller than older ones.
- Pale, yellow-green older leaves and slow growth through peak summer.
- A general loss of vigour and gloss in a plant that should be racing away.
If the symptoms point at watering, light or roots rather than nutrition, the full giant taro care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Because you feed often, salts accumulate faster — flush the pot of giant taro with plain water until it drains freely roughly every month through the feeding season to keep the root zone clean.
Organic vs synthetic feeds for giant taro
Organic options
A diluted seaweed or fish-and-seaweed feed plus a yearly top-dress of worm castings supports fast growth without burn risk. UK: Westland seaweed or Baby Bio Organic; US: Neptune's Harvest or Espoma Indoor!.
Synthetic / liquid feeds
A balanced houseplant liquid at half strength applied frequently — UK: Baby Bio, Phostrogen or Westland Houseplant Feed; US: Miracle-Gro Indoor Plant Food or Dyna-Gro Foliage-Pro for steady leafy growth.
Brand names are examples, not endorsements, and UK and US ranges differ — check the label’s own NPK and dilution rate, since formulations change.
Fertilising giant taro — frequently asked questions
What fertiliser does giant taro need?
A balanced liquid feed (even N-P-K) or a slightly nitrogen-leaning foliage feed — this is a big-leaved foliage plant putting on real size, so it wants steady nitrogen for lush leaves, not a bloom formula. Giant Taro is a genuinely hungry tropical — in bright warmth it pushes growth fast and rewards a regular half-strength balanced feed all season.
How often should I feed giant taro?
A heavy feeder: feed every two to four weeks through spring and summer with a balanced liquid fertiliser at full or half strength to fuel its fast, large growth. Reduce or stop feeding in autumn and winter. Adequate feeding is key to producing its full-sized leaves. A heavy feeder: feed every two to four weeks through spring and summer with a balanced liquid fertiliser at full or half strength to fuel its fast, large growth. Reduce or stop feeding in autumn and winter. Adequate feeding is key to producing its full-sized leaves. For a fast grower like this that means feeding regularly — about sparingly through the growing season — right through spring through early autumn (roughly March to September), tapering off only as light drops in autumn.
What strength of feed for giant taro?
Half strength every feed is the sweet spot for giant taro: frequent enough to fuel fast growth, dilute enough that it never scorches even when you feed often.
What does over-feeding giant taro look like?
Brown, scorched leaf tips and margins despite correct watering. A white salt crust on the soil or around the pot edge. Sudden leaf yellowing and drop shortly after a strong feed. Soft, weak, over-stretched growth that cannot support itself. The mistake here is the opposite of most houseplants: under-feeding a fast tropical in peak season starves it, leaving small, pale new leaves and slow growth — but full-strength doses still burn it, so feed often and weak, not occasionally and strong.
Should I flush the soil of giant taro?
Because you feed often, salts accumulate faster — flush the pot of giant taro with plain water until it drains freely roughly every month through the feeding season to keep the root zone clean.
Keep reading
- Giant Taro care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water giant taro — the watering schedule
- The houseplant fertiliser schedule — feeding through the year
- NPK ratio explained — what the three numbers on the bottle mean
- How to fertilise monstera
- How to fertilise pothos
- How to fertilise fiddle leaf fig
- All 1284 fertilising guides in the Growli library