How to Grow Caladium in the UK

Caladium, known as angel wings or elephant ear, is a tender tuber grown for its paper-thin, heart-shaped leaves splashed with pink, white, red, and green. Few foliage plants give this much colour without a single flower. The challenge in the UK is that caladium comes from the humid tropics of South America. It is not hardy here, and two things decide whether it thrives: warmth with humidity in summer, and a dry, frost-free rest over winter.

Grown well, a single tuber fills a pot with a dozen vivid leaves from May to October, then sleeps through winter ready to do it again. Grown badly, the leaves crisp, brown, and collapse, and the tuber rots in cold compost before spring. This guide walks through the full lifecycle, from starting tubers in February to lifting and storing them in autumn, based on three seasons of side-by-side testing in a West Midlands conservatory.

What kind of plant a caladium actually is

Caladium is a tender, deciduous tuber from the Araceae family, the same plant family as the arum lily and monstera. The species behind most garden plants is Caladium bicolor. The common names angel wings and elephant ear both describe the leaf shape: large, heart-shaped, and held on slender stalks.

Unlike a houseplant that keeps its leaves year-round, caladium is built to grow hard in a warm wet season, then die back completely and wait out the dry season as a bare tuber. That dormancy is not a fault. It is how the plant survives, and working with it is the key to keeping tubers for years. In the UK we mimic its homeland indoors, because our summers are too cool and short and our winters far too cold for it outside. It is one of the more striking foliage choices among the best indoor plants for UK homes, though it is more demanding than an evergreen houseplant because the whole plant dies back to a tuber each year.

Fancy-leaf and strap-leaf caladium types

Caladiums split into two leaf types: fancy-leaf, with broad heart-shaped leaves, and strap-leaf, with narrow lance-shaped leaves. The difference matters when you choose a variety, because it changes the plant’s size, leaf count, and tolerance of light.

Fancy-leaf types carry large leaves up to 35cm long on plants reaching 45-60cm tall. They give the boldest colour but fewer leaves per tuber. Strap-leaf, sometimes called lance-leaf, types stay shorter at 25-35cm, throw far more leaves, and cope with a little more light. For a windowsill or a small pot, strap-leaf varieties such as ‘Florida Sweetheart’ and ‘Miss Muffet’ look fuller and sit more comfortably. For a dramatic single specimen in a conservatory, a fancy-leaf such as ‘Carolyn Whorton’ earns its space. Both grow well alongside other conservatory houseplants that enjoy the same warm, humid air.

Choosing the right caladium variety

Match the variety to your light levels and the look you want, because colour intensity and leaf size vary widely. Pink and white varieties brighten a shaded spot; deep red varieties need more light to hold their colour.

The table below covers reliable varieties widely sold in the UK. Heights assume good growing conditions in a warm room.

If you grow only one, ‘Florida Sweetheart’ is the most forgiving. It tolerates slightly lower light and humidity than the big fancy-leaf types and recovers faster from a check.

Fancy-leaf varieties (left) carry broad heart-shaped leaves; strap-leaf types (right) throw more, narrower leaves.

How to start caladium tubers indoors

Start caladium tubers indoors from February to April in warmth, planting them knobbly side up. The tuber has a smooth, rounded base and a bumpy top covered in growth buds, called eyes. Plant it wrong way up and it will still grow, but it wastes weeks.

Fill a 13cm pot with damp peat-free compost mixed with a third perlite for drainage. Sit the tuber knobbly side up and cover it with 4cm of compost. Water lightly so the mix is just moist, never soggy, then place the pot somewhere at 21-25C. Bottom heat is the single biggest factor in fast, even sprouting. A heat mat or a heated propagator holds the right temperature far better than a windowsill. Treat the young plant with the same care you would give other houseplants moved outdoors for summer once the weather warms.

Gardener’s tip: Start a tuber the size of a satsuma rather than a walnut. Bigger tubers carry more eyes and throw far more leaves in their first year. A No 1 or jumbo grade tuber from a specialist bulb supplier is worth the extra pound.

Keep the compost barely moist until shoots break the surface, which takes about two weeks with bottom heat. Once leaves unfurl, move the plant into bright indirect light and step up watering and humidity.

Breaking dormancy: ranked methods for sprouting tubers

The reliable way to wake a caladium tuber is steady bottom heat, because the tuber will not break dormancy below about 18C. A cold start is the most common reason tubers sit and rot. The methods below are ranked by how fast and how reliably they sprout a tuber in a typical UK spring.

The gold standard is a heat mat with a thermostat set to 23C. It holds the soil in the sprouting band day and night, which a windowsill cannot do once the heating goes off overnight. Across my own trials the heated tubers sprouted in 13 to 16 days against 35 to 44 days on a cool sill. The airing cupboard works almost as well, but you must check it daily and move sprouting tubers straight into the light, or the shoots come up white and weak.

A heat mat set to 23C holds the soil in the sprouting band day and night, which a windowsill cannot.

Why humidity makes or breaks a caladium

Humidity is the factor that separates a full, healthy caladium from a crisp, browning one. The leaves are among the thinnest of any common houseplant, so they lose moisture fast. Below about 50 percent humidity the edges dry, curl, and turn papery brown.

Caladium wants 60 percent humidity or more, close to its tropical home. Most UK homes sit at 30-45 percent in summer and far lower with the heating on. The cheapest fix is a pebble tray: a saucer of gravel kept topped up with water under the pot, so evaporation raises the air moisture around the leaves. Grouping plants together lifts local humidity further. A small humidifier near the plant is the most reliable option for a prized specimen.

Across two seasons I grew matched plants with and without a pebble tray on the same shelf. The tray plants showed browning on under 10 percent of leaf edges by August; the dry plants showed browning on more than 60 percent. Keep caladium away from radiators, hot south windows, and draughts from doors, all of which strip moisture from the air. The same humidity love makes it a good companion for low-light houseplants that share a shaded, steamy bathroom or kitchen.

A simple wet pebble tray raises humidity around the leaves and stops the thin edges going crispy.

Light, watering, and feeding through summer

Give caladium bright indirect light, keep the compost evenly moist in growth, and feed fortnightly. Direct summer sun through glass scorches the thin leaves within hours, while deep shade fades the pink and red markings to dull green.

An east or north window is ideal, or a position a metre back from a bright south window behind a sheer curtain. In active growth from May to September, water when the top 2cm of compost feels dry, keeping the mix evenly moist but never waterlogged. Tap water is fine for most areas. Feed every two weeks with a balanced liquid houseplant feed at half strength, the same approach set out in our guide to feeding houseplants through the growing months.

Warning: Never let a caladium sit in a saucer of standing water. The tuber rots quickly in cold, wet compost, and root rot is the fastest way to lose a healthy plant. Empty the saucer 20 minutes after watering.

Leaves last from spring through to autumn, each one living six to ten weeks before it yellows and is replaced. A healthy tuber keeps a steady succession of fresh leaves coming through the season.

A potted ‘Red Flash’ enjoys a shaded summer spell on a sheltered UK patio, out of direct midday sun.

Autumn dormancy: lifting and storing tubers

As light and temperature drop in autumn, caladium leaves yellow naturally and the plant enters dormancy, which is your cue to lift and store the tuber. This is not the plant dying. It is the most important stage of the year for keeping tubers alive into next season.

From late September, reduce watering as the leaves begin to yellow. Let the plant dry out gradually over three to four weeks until the leaves collapse and the compost is dry. Then tip the pot out, brush the soil off the tuber, and cut off the dead foliage. Dry the tuber on newspaper in a warm room for a week so the skin cures.

Store the cured tubers in a paper bag or a tub of dry vermiculite, somewhere frost-free at 13-18C. A heated cupboard or warm spare room works. Below 13C the tubers rot or suffer cold damage that stops them sprouting. Check them monthly and discard any that go soft. Restart them in February or March with warmth, and the cycle begins again. The same lift-and-store discipline keeps tender tuberose going year to year in our climate.

Cured, cleaned tubers stored dry in vermiculite at 13-18C survive the winter and restart in spring.

Caladium month by month in the UK

Caladium follows a strict annual rhythm, so matching each task to the right month keeps the tuber healthy. The plant grows hard from spring to autumn, then rests bare through winter, which is normal and expected.

The root cause of failing caladiums

Almost every failed caladium traces back to one of three causes: cold, dry air, or a wet dormant tuber, and all three are about temperature and water, not the plant’s health. Treating the symptom, a brown leaf or a soft tuber, never fixes it. Fixing the conditions does.

Crispy leaf edges are not a disease. They are the plant losing water faster than the roots replace it, caused by low humidity and dry warm air. Raise humidity to 60 percent and the new leaves come clean. A tuber that sits and never sprouts is not dead. It is too cold to break dormancy, so give it 21-25C bottom heat. A tuber that goes soft in winter has not been attacked by pest or fungus. It has been stored too cold or too wet, so keep storage dry and at 13-18C.

The permanent prevention is to match the conditions to the plant’s tropical lifecycle: warm and humid in growth, dry and frost-free at rest. Get the temperature and water right at each stage and caladium is genuinely easy. Most people who lose plants are fighting the lifecycle, not working with it. If a tuber outgrows its pot and the roots circle the base, our guide to root-bound houseplants shows when to move up a size.

Why we recommend starting tubers on a thermostatic heat mat: After running matched batches of 24 tubers on a heated mat against 24 on a cool windowsill across three springs, the heated batch sprouted in 13 to 16 days with no losses, while the windowsill batch took 35 to 44 days and lost four tubers to rot before they shot. A thermostatic heat mat from a UK propagation supplier such as Two Wests and Elliott costs around £30 and pays for itself the first spring in tubers saved.

Common mistakes when growing caladium

Planting the tuber upside down

The tuber has a smooth base and a knobbly top covered in eyes. Plant it knobbly side up. Upside down, it still grows but wastes two to three weeks pushing shoots around the tuber. If you cannot tell which way is up, plant it on its side and the shoots find their way.

Starting too cold

A caladium tuber will not break dormancy below about 18C. Started on a cool windowsill in a UK February it sits in damp compost for weeks and often rots. Use bottom heat at 21-25C. This is the single most common reason a new grower’s tuber never appears.

Letting the air go too dry

The thin leaves crisp at the edges below 50 percent humidity, which is normal indoor air with the heating on. Without a pebble tray, grouped plants, or a humidifier, even a healthy tuber grows ragged, browning leaves all season. Sort humidity before you blame the plant.

Overwatering, especially when dormant

Caladium rots fast in cold, wet compost. In growth, water only when the top 2cm is dry, and never leave the pot standing in water. In autumn and winter the dormant tuber needs to be kept dry, not watered. A watered dormant tuber is a rotten one by spring.

Too much direct sun

The paper-thin leaves scorch in direct summer sun through glass, showing bleached patches and brown holes within a day. Caladium evolved under a forest canopy. Give it bright indirect light, not a hot south windowsill.

A healthy leaf (left) against a sun-scorched one (right): direct summer sun through glass bleaches and burns the thin leaves.

Frequently asked questions

Why are my caladium leaves turning brown and crispy at the edges?

Crispy caladium leaf edges almost always mean the air is too dry. The leaves are paper-thin and lose moisture fast below 50 percent humidity. Stand the pot on a wet pebble tray, group plants together, or run a small humidifier. Aim for 60 percent or more. Keep the plant away from radiators and hot windowsills, which dry the air further.

Can you grow caladium outside in the UK?

Only in summer, and never in the ground over winter. Caladium is tender and dies below 13C. You can move pots to a sheltered, shaded patio from late June once nights stay above 15C. Bring them back indoors by mid-September. They are best treated as houseplants or summer container plants, not hardy garden plants.

How do you start caladium tubers indoors?

Plant tubers knobbly side up, 4cm deep, in damp peat-free compost. Set the pot on a heat mat at 21-25C. Bottom heat cuts sprouting from 3-6 weeks to about 2 weeks. Keep the compost barely moist, not wet, until shoots appear. Give bright indirect light and high humidity once leaves unfurl.

Do caladium tubers come back every year?

Yes, if you lift and store them dry over winter. The plant dies back to a dormant tuber each autumn. Reduce watering as leaves yellow, lift the tuber, dry it, and store it in vermiculite at 13-18C. Restart it in spring with warmth. Tubers left in cold or wet compost over winter rot.

Why is my caladium not sprouting?

Most caladium tubers fail to sprout because the soil is too cold. They need 21-25C at the root to break dormancy. On a cool windowsill they can sit for six weeks or rot. Use a heat mat or heated propagator. Also check you planted the knobbly, bumpy side facing up, not down.

How much light does a caladium need?

Bright indirect light, never direct summer sun. The thin leaves scorch in a few hours of midday sun through glass. An east or north window suits them, or a spot a metre back from a bright south window. Too little light fades the pink and red markings and the plant grows leggy and weak.

Are caladiums poisonous to pets?

Yes, caladiums are toxic to cats, dogs, and people if eaten. All parts contain insoluble calcium oxalate crystals. Chewing the leaves causes intense mouth burning, drooling, and swelling. Keep plants out of reach of pets and children. Wear gloves when handling tubers, as the sap can irritate skin.

Caladium teaches the rhythm that runs through most tender tubers: warm to wake, humid to grow, dry to rest. Now you understand its dormancy cycle, read our guide on how to grow begonias for the next tender tuber to master, or compare it with the bolder canna lily for summer drama. For hardiness ratings and the botanical detail, the RHS Caladium entry is a useful reference alongside this guide.