Reunion Island Begonia (Salazie begonia) care

Light

Picture the indirect light an east-facing window gives mid-morning — that's the brightness reunion island begonia grows fastest in. Bright to medium indirect light suits this species best; replicate the dappled light of a cloud-forest understorey and avoid any direct sun, which quickly scorches foliage. You'll know it's right when new leaves come out the same size and colour as the established ones. Smaller, paler new leaves = move closer to the window.

Watering

Aim for when the top 2 cm of compost feels dry, approximately every 7 days for reunion island begonia, but treat that as a starting point rather than a rule. A south-facing summer windowsill will dry the pot twice as fast as a north-facing winter room. Lift the pot; if it feels noticeably lighter than it did wet, water it. Keep moisture consistent but never allow the pot to sit in standing water; this species benefits from slightly more even moisture than arid-tolerant begonias, reflecting its misty island habitat.

Soil and pot

Reunion Island Begonia grows best in humus-rich, free-draining compost. Mix three parts peat-free compost with one part perlite and one part fine bark; the mix should retain some moisture while draining freely to prevent root rot. A pot with a working drainage hole is non-negotiable for this species — even free-draining mix will turn soggy in a closed planter. If you love the look of a decorative pot without a hole, use it as a cachepot around an inner nursery pot you can lift out to water.

Humidity and temperature

Reunion Island Begonia sits happiest at around 60–80% humidity and 12–22 °C (54–72 °F). High humidity is essential for this cloud-forest native; use a cool-mist humidifier nearby and group plants together — do not mist directly onto leaves. If you keep the room above 12–22 °C year-round and avoid placing the plant near a cold draught, a hot radiator, or an air-conditioning vent, you have already handled the two biggest indoor stressors.

Fertilising

Feed reunion island begonia sparingly. Apply a dilute (quarter-strength) balanced liquid feed every two to three weeks during active growth; the species is sensitive to fertiliser burn so err on the side of under-feeding. Skip fertiliser entirely on a stressed, recently-repotted, or actively wilting plant — fertiliser salts make damage worse, not better. Wait for a round of healthy new growth before resuming a feeding rhythm.

Common problems

Below are the issues we see most often on reunion island begonia in the Growli community. Each is annotated with the most common cause so you know where to start.

• Heat stress and leaf scorch — Temperatures above 25 °C cause wilting, yellowing, and leaf edge scorch; move to a cooler, well-ventilated position — ideally below 22 °C — and shade from any direct sun.
• Powdery mildew — Poor air circulation combined with low light encourages powdery mildew on the leaves; improve airflow, avoid overhead watering, and treat early infections with a dilute potassium bicarbonate spray.

Propagation

Stem tip cuttings rooted in a moist perlite mix under gentle bottom heat (18–20 °C) are the most reliable method; seed is possible but rarely available. Propagation is the cheapest, most satisfying way to expand a collection — and it doubles as insurance against losing a mature plant to an accident. Take a backup cutting once the parent is established and healthy.

Toxicity to pets

Reunion Island Begonia is toxic to pets. As a Begonia species it is toxic to cats and dogs per the ASPCA; soluble calcium oxalates (highest in tubers and roots) cause oral burning, excessive drooling, vomiting, and difficulty swallowing upon ingestion. If you keep cats, dogs, or curious children in the house, weigh placement carefully — a high shelf or a hanging planter is enough for casual safety. For severe ingestion incidents, call your local vet and the ASPCA Animal Poison Control Center (in the US, 888-426-4435).

Pet-safety status is sourced from the ASPCA Toxic and Non-Toxic Plant List, which catalogues the most-asked-about plants for cats, dogs, and horses.

Reunion Island Begonia deep-dive guides

Every aspect of reunion island begonia care, each with its own calibrated guide:

• Common reunion island begonia problems & fixes
• Reunion Island Begonia watering schedule
• Reunion Island Begonia light requirements
• Best soil mix for reunion island begonia
• Reunion Island Begonia fertilizing guide
• When to repot reunion island begonia
• How to propagate reunion island begonia
• How to prune reunion island begonia
• What's eating my reunion island begonia?
• Reunion Island Begonia growth rate & size
• Reunion Island Begonia cold hardiness
• Reunion Island Begonia temperature & humidity
• Is reunion island begonia toxic to cats & dogs?
• Is reunion island begonia toxic to cats?
• Is reunion island begonia toxic to dogs?
• All 241 Begonia varieties

Featured in these plant shortlists

Reunion Island Begonia qualifies for 7 curated Growli shortlists — each one filtered objectively from our structured plant-care library, so the selection is consistent and checkable:

• Best low-light houseplants — Houseplants that need no direct sun and cope with a north-facing room or a spot well back from a window.
• Best plants for a north-facing window — Houseplants for a north-facing window: bright, even, indirect light and no scorching direct sun. Each pick verified against its documented light needs.
• Best humidity-loving houseplants — Houseplants that thrive in a bathroom, kitchen, or by a humidifier — selected by documented humidity preference.
• Best bathroom plants — Humidity-loving houseplants that also cope with lower light — suited to the steamy, often-dim conditions of a typical bathroom.
• Houseplants toxic to cats & dogs — The common houseplants the ASPCA lists as toxic to cats and dogs — the ones to keep out of reach, each with its symptoms and a safe alternative.
• Best small & tabletop houseplants — Compact houseplants that stay under about 40 cm — desk, shelf and windowsill plants that never outgrow a small space.
• Best fast-growing houseplants — Houseplants documented as fast or vigorous growers — quick to fill a pot, cover a pole or trail down a shelf.
• Browse all 29 plant shortlists — pet-safe, low-light, drought-tolerant and more

Related guides

Reunion Island Begonia is also commonly called Reunion Island begonia or Salazie begonia.

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• All 10153 plant care guides in the Growli library