Caladiums are the showiest aroids you can grow indoors. Big heart-shaped leaves on long thin stems, in patterns that range from spotted to mottled to veined to marbled to striped. Colours run white, green, red, pink, even silver. Leaves can reach 30cm across in good conditions.

The trade-off is that they're seasonal. Caladiums grow from tubers, and like a lot of tuberous plants, they die back completely through the cooler months and wait out the cold underground. For three-quarters of the year you get spectacular foliage. For the other quarter, you get a pot of mix with nothing visible in it. If you can make peace with that rhythm, they're one of the most rewarding plants in the aroid family.

Caladiums are members of the Araceae family — the same family as Monstera, Philodendron, Alocasia, and Anthurium. That family connection runs through the care: chunky mix, steady feeding during active growth, bright indirect light, humidity above the household average.

Caladiums also flower, technically. The flower is a small spike (a spathe) that's barely worth looking at compared to the foliage. If you see one developing, cut it off — the plant will redirect that energy into more leaves.

Light

Bright, indirect light is the sweet spot. They tolerate medium light indoors, but the brighter the position the better the colour and the bigger the leaves. The foliage is thin and papery, which means it burns quickly — keep them well clear of harsh direct afternoon sun. Gentle morning sun is generally fine.

One useful field-rule: the narrower the foliage on a given Caladium cultivar, the more light it can tolerate. The wide, paper-thin leaves on the more dramatic cultivars are particularly sensitive to direct sun.

Shadow Test: Hold your hand about 10cm above a leaf at midday. A crisp, defined shadow means good light — the plant will push colourful, well-developed foliage. A soft, fuzzy shadow means low light — the plant will survive, but expect smaller, paler leaves and a shorter growing season.

Water

While the plant is in active growth (spring through autumn for most of Australia), the mix wants to stay evenly moist — not wet, not dry, just consistently damp. Caladiums are tropical and used to a constant moisture supply during their growing period.

The watering rhythm changes dramatically heading into dormancy. As leaves start dying back in autumn, taper watering down. Once the plant is fully dormant, stop watering completely. A dry tuber sits dormant fine; a wet tuber in cool conditions rots. More on this in the Dormancy section below.

Pot Weight Test: Lift the pot just after watering, then every couple of days through the growing season. Caladiums in active growth dry faster than most aroids because they're transpiring through large, thin leaves. In summer in a bright spot you might be watering twice a week. The plant tells you. The calendar doesn't.

Mix

Caladiums want a mix that retains moisture but still drains freely — they hate sitting in soggy mix, but they also hate drying out completely during growth. A coco coir-based blend with added perlite and bark works well, which is essentially the structure of a good aroid mix.

A specialised Aroid Mix handles this — bark, perlite, coco coir and charcoal in proportions that hold moisture without compacting.

Finger Probe Test: Push your index finger as deep into the mix as it'll go. What you find tells you something useful:

• Cool, dark, slightly damp: the mix is doing its job — exactly what Caladiums want in active growth.
• Wet, heavy, compacted: the mix is too dense. The tuber is at risk, especially as temperatures drop.
• Dry, crumbly, falls off your finger: the mix has gone hydrophobic. Water runs through without absorbing.
• Hitting the tuber: depending on tuber size and pot depth, this can happen surprisingly close to the surface. Don't push hard. If the tuber feels firm, that's fine. If it feels soft, you've got rot.
• Sour or musty smell on your finger: the mix has gone anaerobic — lost oxygen. Repot urgently into fresh, chunky mix.

You're not chasing a verdict on every reading. You're building a picture of how your mix behaves over time.

Caladiums don't need annual repotting. Every two years is plenty, ideally done in spring as the plant is breaking dormancy and you can inspect the tuber at the same time.

Feed

While the plant is in active growth, feed fortnightly with a liquid fertiliser. When the plant slips into dormancy, stop feeding completely.

Aroid Plant Food is the natural fit — urea-free, nitrate-based nitrogen, with chelated micronutrients that support healthy growth and good colour development. Use at the rate on the bottle, every two weeks, while the plant is actively growing.

A note on older Caladium care advice: you'll often see recommendations to use a high-nitrogen fertiliser (NPK numbers of 10 or higher on the N). This was the standard advice for years, but in practice high-N fertilisers push soft, leggy growth that's more vulnerable to pests and structural failure — particularly under imperfect indoor light. A balanced aroid-specific formula gives you stronger leaves with better colour.

If you're feeding a mixed indoor collection, Indoor Plant Food is a balanced all-rounder that handles Caladiums well during their growing season. Same fortnightly cadence, same rule about stopping at dormancy.

Dormancy

This is the section that catches a lot of Caladium owners out, so worth covering properly.

In autumn, your Caladium will begin shedding leaves. Within a few weeks, the plant will have lost everything above the mix. The tuber underneath is fine — it's storing energy and waiting for warmer temperatures and longer days. A dormant Caladium is not a dead Caladium.

The simple approach (works for most people):

When you see the first new growth pushing up in spring, slowly resume watering and feeding. By mid-spring, the plant should be back to its active-growth rhythm. Warmth matters as much as day length here — Caladium tubers wake to soil temperature, not the calendar, so a cold spring can delay things by weeks.

This approach is slightly less reliable than the textbook method, but it works for most home growers and requires nothing beyond patience.

The textbook approach (for keen growers, or if you've had dormancy failures before):

Once the plant is fully dormant, lift the tuber from the pot, gently brush off most of the mix, and store it in a paper bag or other container that lets air move freely (not a sealed plastic bag or container — that traps moisture and rots the tuber). A cool, dark spot at around 15-20°C is ideal. Repot into fresh mix in spring and resume watering as growth emerges. This reduces the risk from cold and moisture variability through winter and gives you the highest dormancy survival rate.

The simple approach is genuinely fine for most cases. The textbook approach is what to switch to if you've lost a tuber to rot before, or if your house gets cold and damp through winter.

Troubleshooting

Yellowing leaves during growing season: Usually a watering issue — either too much or too little. Run the Pot Weight Test, check the mix structure with the Finger Probe Test. Caladiums in good light and good mix rarely yellow without a reason.

Yellowing leaves heading into autumn: Normal. The plant is preparing for dormancy. Don't intervene — let the natural die-back happen.

Brown leaf edges or patches: Usually low humidity combined with inconsistent moisture, or direct sun damage. Caladium leaves are particularly vulnerable to dry air; humidity above 50% helps significantly. A pebble tray or humidifier can make a noticeable difference.

Small, pale, washed-out leaves: Light. The plant is reaching for more than it's getting. Move it to a brighter spot.

Plant fails to emerge from dormancy: Tuber may have rotted. Gently dig down and check. A firm, slightly wrinkled tuber is fine — keep waiting. A soft, mushy tuber has rotted, usually from being kept too wet through dormancy.

Pests: Caladiums aren't particularly pest-prone, but spider mites can show up in dry indoor air during active growth. Regular leaf cleaning with a damp cloth or Neem Oil Leaf Shine keeps the foliage clean and helps you spot problems early.

Good to Know

Caladiums are toxic to pets and humans if chewed. Like most aroids, they contain calcium oxalate crystals which cause oral pain, swelling, drooling, and gastrointestinal discomfort. Worth knowing if you've got curious pets or toddlers. The indoor plants safe for cats and indoor plants safe for dogs guides cover safer alternatives.

One last point worth knowing: Caladium cultivars vary significantly in their dormancy intensity. Some modern hybrids ('Florida Sweetheart', 'White Christmas') have been bred for shorter or less complete dormancy and may hold some leaves through winter in a warm Australian indoor environment. Older cultivars die back completely. If your plant disappears entirely, that's not a problem — it's just doing what its parents did in tropical South America.