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Fertilising guide

How to fertilise Caladium (Caladium bicolor)— schedule & NPK

Also called angel wings, elephant ear (small), heart of Jesus.

About Caladium

Caladium bicolor · also called angel wings, elephant ear (small) · tropical

Caladium is a tuberous tropical from Brazil with paper-thin heart-shaped leaves in pink, white, red, and green patterns. Grown indoors for a season or outdoors in summer beds; tubers go fully dormant in winter. Toxic to pets due to insoluble calcium oxalates.

Caladium bicolor, a tuberous tropical perennial native to forests of South and Central America that naturally experience pronounced wet and dry seasons.

A heavy feeder during growth — use a low-nitrogen or balanced formula, since excess nitrogen greens out and dulls the prized leaf coloration.

Growth habit: Tuberous tropical perennial; dormant in winter

Watch for — Pale washed-out colour: Too much direct sun.

Sources: hort.extension.wisc.edu, missouribotanicalgarden.org, aspca.org

What fertiliser caladium actually wants — and why

Caladium 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 caladium: 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 caladium, 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 caladium:

Half-strength balanced feed every 4 weeks during active growth. For a fast grower like this that means feeding regularly — about every 4 weeks — 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 caladium 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 caladium

Half strength every feed is the sweet spot for caladium: 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 caladium first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the caladium watering schedule.

Signs you are over-feeding caladium

Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for caladium:

Signs you are under-feeding caladium

If the symptoms point at watering, light or roots rather than nutrition, the full caladium 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 caladium 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 caladium

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 caladium — frequently asked questions

What fertiliser does caladium 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. Caladium 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 caladium?

Half-strength balanced feed every 4 weeks during active growth. Half-strength balanced feed every 4 weeks during active growth. For a fast grower like this that means feeding regularly — about every 4 weeks — right through spring through early autumn (roughly March to September), tapering off only as light drops in autumn.

What strength of feed for caladium?

Half strength every feed is the sweet spot for caladium: frequent enough to fuel fast growth, dilute enough that it never scorches even when you feed often.

What does over-feeding caladium 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 caladium?

Because you feed often, salts accumulate faster — flush the pot of caladium with plain water until it drains freely roughly every month through the feeding season to keep the root zone clean.

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