Polka Dot Begonia is the most photographed begonia: dark green, angel-wing leaves covered in neat silver-white spots, with deep red undersides that flash when the leaves move. Add clusters of white or pink flowers, and it is easy to see why this is one of the most popular houseplants of recent years.
It grows upright on cane stems like Angel Wing Begonia, and it can get tall — over a metre — so it needs a stake and room to grow up. The spotted leaves are the show, so give it a spot where the light catches the silver spots and the red undersides. The spots fade in poor light, and the plant goes leggy fast if it is left in a dim spot. Bright light and regular pruning are what keep it looking like the plant in the photos. This guide covers exactly what it needs: light, watering, humidity, temperature, soil, repotting, feeding, propagation and the common problems that show up when something is off.
Polka Dot Begonia at a glance
| Care factor | What this plant needs |
|---|---|
| Botanical name | Begonia maculata |
| Light | bright indirect |
| Water | weekly; keep soil lightly moist, avoid wet leaves |
| Humidity | moderate to high |
| Temperature | 65–75°F (18–24°C) |
| Repotting | every 1–2 years |
| Pet safety | toxic to cats and dogs |
Light
Give your Polka Dot Begonia bright indirect. Bright indirect light keeps the spots crisp and the red undersides deep. In too little light the spots fade, the leaves turn plain green, and the stems stretch. A little gentle morning sun is fine, but harsh midday sun scorches the leaves, so keep it back from a south-facing window or behind a sheer curtain. Our grow-light calculator can help work out whether your spot is bright enough, and our sunlight calculator can help you check how much light a window really gets through the day.
Watering
Water as follows: weekly; keep soil lightly moist, avoid wet leaves. Water weekly and keep the soil lightly moist, watering at the base and keeping the leaves dry. Water thoroughly until it runs from the drainage holes, then empty the saucer. Let the top of the soil dry slightly between waterings, and ease off in winter when growth slows — soggy soil is the fastest way to lose this plant. Our watering calculator gives a starting point for your pot size, and the watering schedule generator can help you build a routine around it.
Humidity and temperature
Polka Dot Begonia needs moderate to high humidity and temperatures of 65–75°F (18–24°C). Polka Dot Begonia likes moderate to high humidity, and dry air shows as brown, crispy leaf edges. Grouping plants together or a pebble tray helps, and a humidifier is the reliable fix in a dry heated home. Do not mist the spotted leaves — wet foliage invites powdery mildew, and water marks show clearly on the dark leaves. Our humidity and temperature checker can tell you whether your room suits this plant. Temperature matters just as much as humidity: keep it away from cold windows in winter, from radiators that dry the air, and from air-conditioning vents that blast cold air directly at it.
Soil and potting
Indoors, this plant needs a rich but very free-draining potting mix. A light, free-draining mix suits it: potting soil with perlite and a little bark or coco coir. The pot must have drainage holes, and a heavy pot helps stop a tall plant toppling. Stake the main stems to a cane as it grows, tying loosely so the stems are supported without being strangled. Our potting-mix calculator can work out the parts for a homemade mix for your pot size, and our soil volume calculator can work out how much mix you will need.
Repotting
Repot every 1–2 years, in spring, or sooner if roots are circling the drainage holes. Repot in spring when roots are circling the drainage holes, moving up only one pot size. Repotting is also the moment to prune leggy stems and take cuttings — see Propagation below. Handle it gently: the cane stems are brittle and snap easily if the plant tips. Our repotting calculator can help you work out the next pot size and how much fresh mix you will need.
Feeding
Feed during the growing season, in spring and summer, with a balanced liquid houseplant fertiliser at half the strength on the label, roughly once a month while the plant is actively growing. Feed in spring and summer with a balanced liquid fertiliser at half strength, about once a month while it is actively growing, and a little more when it is flowering. Do not feed in autumn and winter when growth slows. Flush the soil with plain water occasionally to wash out fertiliser salts, which show as brown leaf edges. Our fertiliser calculator can help you work out the right amount for your pot size. Always follow the directions on the label — more fertiliser is not better, and excess salts build up in the soil and burn the roots.
Propagation
Polka Dot Begonia propagates easily from stem cuttings. Take a tip cutting with a few leaves in spring or summer, remove the lower leaves, and place it in water or straight into moist, free-draining mix. Roots usually appear within a few weeks; once rooted, pot the cutting up and keep it warm and bright, out of direct sun. Pruning a leggy plant in spring gives you cuttings and a bushier parent plant at the same time.
Common problems and fixes
| Problem | Likely cause | Fix |
|---|---|---|
| Dropping leaves | overwatering or cold | Check soil moisture and cold draughts; keep watering steady and the plant settled. |
| Leggy growth | too little light | Move to brighter light; prune back long stems to encourage branching. |
| Powdery mildew | wet leaves and poor air flow | Keep leaves dry; improve airflow and remove affected leaves. |
Dropping leaves
Likely cause: overwatering or cold. Dropping leaves usually mean the plant is stressed by overwatering or by cold. Check the soil first: if it is soggy, let it dry out and check that the pot drains freely. If the soil is fine, look for cold — a draught, a cold window, or a sudden move to a much cooler spot can all make this plant shed leaves. Move it somewhere warm and settled, keep watering steady, and it should stop dropping leaves once it settles; new growth follows in the growing season.
Leggy growth
Likely cause: too little light. Leggy growth — long, bare stems with leaves spaced far apart — means the plant is reaching for more light. Move it to a brighter spot with the light level given in the table above, and prune back the longest stems to encourage branching from lower down. Do not expect the stretched stems to fill back in on their own; the fix is brighter light plus a trim, and the cuttings can usually be propagated. Our grow-light calculator can help check whether your spot is bright enough.
Powdery mildew
Likely cause: wet leaves and poor air flow. Powdery mildew shows up as a white, powdery coating on the leaves, and it thrives where leaves stay wet and the air does not move. Water at the base of the plant, never over the leaves, and give the plant space and gentle air circulation so the foliage dries. Remove badly affected leaves, improve airflow, and keep the leaves dry — mildew spreads fast in still, damp air, so early action matters. Our plant disease checker can help confirm what you are looking at.
Frequently asked questions
How often should I water Polka Dot Begonia?
weekly; keep soil lightly moist, avoid wet leaves. Water weekly and keep the soil lightly moist, watering at the base and keeping the leaves dry. Check the soil with your finger before you water — the surface can look dry while the soil below is still wet, and the plant's needs change with the season, the pot size and the light.
How much light does Polka Dot Begonia need?
It needs bright indirect. Bright indirect light keeps the spots crisp and the red undersides deep. Too little light gives stretched, pale growth, and harsh direct sun — where it is not wanted — scorches the leaves.
Is Polka Dot Begonia safe for cats and dogs?
According to the data used for this guide, this plant is toxic to cats and dogs. Keep it out of reach of pets that chew plants, and if a pet eats any of it, contact your vet.
Why are the spots on my Polka Dot Begonia fading?
Too little light. The silver spots need bright indirect light to stay crisp; in a dim spot new leaves come through plain green and the stems stretch. Move the plant to a brighter spot, out of harsh direct sun, and judge by the new leaves — old leaves will not regain their spots.
What should I do if my Polka Dot Begonia looks unhappy?
Start with the basics: check the soil moisture, the light, and the temperature, and look at the problems table above. Most unhappy houseplants are unhappy about water, light or cold, not about a rare disease — fix the care first, give the plant a few weeks, and judge it by the new growth, not by the damaged leaves, which will not heal.