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Plant guideBegonia care: the complete guide
Guidance verified against Clemson Cooperative Extension Home & Garden Information Center, the American Begonia Society and the ASPCA on 21 September 2026. Sources linked below.
Begonia wants bright, indirect light, soil kept evenly moist but never soggy, humidity raised around the plant rather than misted onto its leaves, and 13 to 29°C (55 to 85°F). It is toxic to cats, dogs and horses if eaten. Begonia is also a genus of thousands of varieties split into two very different care groups, foliage types grown for colourful leaves and flowering types grown for blooms, and knowing which one you have changes how much light and humidity it actually wants.
| Attribute | What a begonia needs |
|---|---|
| Light | Bright, indirect light; foliage types (rex) want dappled shade, flowering types (wax, tuberous) want brighter light and some morning sun to bloom well |
| Water | Evenly moist, drying slightly between waterings; never let the pot sit in water, water at the base rather than over the leaves |
| Humidity | High, but raised around the plant, not misted directly onto the leaves |
| Soil / pot | Well-draining mix rich in organic matter; a pot with drainage holes |
| Fertiliser | Balanced fertiliser worked in at planting, then a higher-phosphorus feed monthly through the growing season to support blooms |
| Temperature | 13 to 29°C (55 to 85°F); avoid cold drafts and heating vents |
| Toxicity | Toxic to cats, dogs and horses (ASPCA); roots and tubers are the most toxic part |
Is my begonia grown for its leaves or its flowers?
Check the leaves first: if they are large, patterned or colourful and the flowers are small and easy to miss, it is a foliage type; if it flowers freely under decent light, it is a flowering type. Rex and other rhizomatous begonias are grown almost entirely for foliage, per Clemson HGIC, with leaves ranging from maple-leaf to round to ruffled in colours from silver to deep purple, and many growers pinch off the small flowers so the plant puts its energy into leaves instead. Wax, tuberous and cane-type (angel-wing) begonias are grown for their blooms and flower far more reliably in bright light. This split matters for care: foliage types are biologically suited to dappled shade, high humidity and rich, airy soil, and are quick to rot in soggy conditions or scorch in strong sun, while flowering types are the easier, sturdier group and tolerate more direct light and a wider range of conditions. The rest of this guide gives ranges wide enough for both groups, noting where the two genuinely diverge.
How much light does a begonia need?
Bright, indirect light suits most begonias, but the two care groups differ at the edges. Per Clemson HGIC, foliage begonias do best in a bright spot out of direct sun, since strong light scorches their leaves and washes out the patterning they are grown for, while flowering begonias want a brighter spot and benefit from some direct sun, with gentle early-morning sun in an east-facing window working well to encourage blooms. Too little light on a flowering type produces a leggy plant with few flowers; too much direct light on a foliage type burns the leaves. The general light guide covers reading a room's light level for other houseplants.
How often should you water a begonia?
Keep the soil evenly moist, letting it dry out slightly between waterings, and never let the pot sit in standing water. Per Clemson HGIC, begonias are highly susceptible to root rot, so soggy, waterlogged soil is a far more common cause of a dying begonia than under-watering. Water at the base of the plant rather than over the top whenever possible, since wet foliage sitting damp for hours is exactly the condition the powdery mildew and stem rot covered below need to take hold. The general watering guide covers the finger test and how it varies by species.
Does a begonia need humidity, and can you mist it?
Yes, begonia wants a humid environment, but misting the leaves directly is the wrong way to provide it. Per Clemson HGIC, spray the surrounding air rather than the plant itself; wetting the leaves and letting them stay damp, especially in a cool room, favours the same fungal problems, powdery mildew and botrytis stem rot, that watering over the top of the plant does. Raise ambient humidity instead with a pebble tray, a room humidifier, or by grouping plants together, and keep the leaves themselves dry. This is a sharper rule than most humidity-loving houseplants on this site get, where misting is a minor, imperfect help rather than something to actively avoid. The general humidity guide covers grouping, trays and misting for other houseplants.
What soil and pot does a begonia need?
A well-draining potting mix rich in organic matter, in a pot with drainage holes. Per Clemson HGIC, this balance matters both ways: enough organic matter and moisture retention to suit the evenly-moist watering routine above, but still free-draining enough that the roots are never left sitting in wet mix, since that combination of moisture and poor drainage is what tips a begonia into root rot. The general soil and pot guide covers mix types and pot sizing for other houseplants.
How and when do you fertilise a begonia?
Work a balanced, general-purpose fertiliser into the soil at planting, then feed monthly through the growing season with a fertiliser higher in phosphorus than nitrogen to support new blooms. Per Clemson HGIC, the higher-phosphorus routine is aimed specifically at flowering types; foliage begonias grown for leaves rather than flowers do fine on a balanced feed at the same monthly interval, without needing the bloom-boosting ratio. Stop or cut back feeding over autumn and winter, when growth slows. The general fertilising guide covers dilution ratios and spotting salt build-up in the soil.
What temperature does a begonia need?
Begonia is comfortable between about 13 and 29°C (55 to 85°F). Per the American Begonia Society, optimum temperatures range from 55°F at night to 85°F during the day, with some variation between types, rex begonias sit toward the cooler, steadier end of that range while some flowering types tolerate brief spells above it. Keep begonias away from cold drafts, open windows and heating or air-conditioning vents, since a sudden temperature swing is a common, easily-missed cause of leaf drop, covered in the problems table below. The general temperature guide covers safe ranges, drafts and heating vents for houseplants generally.
How do you propagate a begonia?
Most begonias propagate readily from a leaf cutting. Slice across the main veins on the underside of a healthy leaf, then lay the leaf flat, vein-side down, onto moist rooting mix; new plantlets form at each cut point along the vein rather than from a single stem tip, a method this site's own propagation guide already names begonia and African violet as the classic examples of. Cane-type and fibrous begonias also root well from an ordinary stem cutting, and tuberous begonias are more commonly propagated by dividing the tuber itself, similarly to how a rhizome is divided on plants such as prayer plant. Leaf cuttings are slower than stem cuttings and, for some species, will root without ever producing a full new plant, so a stem cutting or division is the more reliable choice whenever the type of begonia in hand offers it.
Why is my begonia getting powdery, rotting or dropping leaves?
| Symptom | Likely cause | Fix |
|---|---|---|
| White, powdery coating on leaves and stems | Powdery mildew, favoured by cool temperatures, high humidity and poor air circulation | Improve airflow, space plants apart, pick off affected leaves; avoid misting the foliage |
| Brown, mushy, water-soaked spots on stems or leaves that spread quickly | Botrytis blight (stem rot), favoured by cool, wet conditions | Remove infected growth immediately, improve airflow, water the soil rather than the plant |
| Yellow, mushy leaves and a soft stem base | Root rot from soggy, poorly-drained soil | Let the soil dry more between waterings and check the pot actually drains |
| Sudden leaf drop with no other symptom | Cold draft, an air-conditioning vent, or another sudden temperature swing | Move away from vents, open windows and drafty spots |
| Fine speckled leaves, sticky residue or small white cottony clusters | Spider mites, scale or mealybugs | See the spider mites guide for the verified treatment method |
See the general yellow leaves and brown and crispy leaves guides for the wider decision tree behind these symptoms on other houseplants.
Is a begonia toxic to cats and dogs?
Yes. The ASPCA lists begonia as toxic to cats, dogs and horses, containing soluble calcium oxalates that typically cause vomiting and salivation if a pet chews or eats part of the plant. The roots and tubers, the underground parts, are the most toxic part of the plant, more so than the leaves. This is a genuine safety consideration for homes with pets that dig in pots, unlike non-toxic plants already on this site's pet-safe list such as prayer plant and peperomia; keep begonias, and their pots, out of reach of curious pets.
FAQ
- Is my begonia grown for its leaves or its flowers?
- Check the leaves and flowers. Rex and rhizomatous begonias are grown for colourful foliage with small flowers; wax, tuberous and cane types are grown for their blooms and flower freely in bright light.
- How often should you water a begonia?
- Keep the soil evenly moist, letting it dry slightly between waterings, and never let it sit in standing water. Begonias are highly prone to root rot.
- Can you mist a begonia to raise humidity?
- Not directly on the leaves. Wet leaves favour powdery mildew and stem rot; raise humidity around the plant instead with a pebble tray or humidifier.
- Is a begonia toxic to cats and dogs?
- Yes. The ASPCA lists begonia as toxic to cats, dogs and horses, with the roots and tubers the most toxic part.
- How do you propagate a begonia?
- Most types propagate from a leaf cutting laid vein-side down on rooting mix. Cane types also root from stem cuttings, and tuberous types are usually divided.