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Light requirements

How much light does Reunion Island Begonia (Begonia salaziensis) need?

Also called Reunion Island begonia, Salazie begonia.

More about reunion island begonia

About Reunion Island Begonia

Begonia salaziensis · also called Reunion Island begonia, Salazie begonia · tropical

Begonia salaziensis is a rare fibrous-rooted species endemic to the cloud-forest habitats of Réunion Island in the Indian Ocean, where it grows as an understorey plant in cool, misty conditions. It produces attractive foliage and small pink to white flowers, preferring consistently cool temperatures that distinguish it from most tropical begonias. The single most critical care point is to keep temperatures below 25 °C, as prolonged heat causes rapid decline in this naturally cool-adapted species. This plant is toxic to cats and dogs.

Comfort temperature: 12–22 °C

Watch for — 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.

The exact light reunion island begonia needs

Reunion Island Begonia is an adaptable, forgiving plant for medium indirect light — it does best a couple of metres from a window, and is one of the easier plants to place well.

Put a number on it — this is what a meter (or a free phone light-meter app) should read where reunion island begonia sits:

In plain terms, A couple of metres from a bright window, beside a north or east window, or anywhere a room feels comfortably light to read in without a lamp during the day. Hours of direct midday sun (it will scorch even though it tolerates a lot) and genuinely gloomy back corners with no view of the sky.

Not sure how to read the light in your home? Our light meter guide walks through measuring footcandles and lux with a free phone app and turning the reading into a placement decision for reunion island begonia.

Signs reunion island begonia is getting too much light

The most exposed leaves show it first. For reunion island begonia specifically, watch for:

Light damage does not heal — a scorched leaf stays scorched — so the fix is to move reunion island begonia out of the harsh light rather than wait for it to recover.

Signs reunion island begonia is not getting enough light

Too little light is slower and sneakier than too much. The classic tell is etiolation: the plant stretches and pales as it reaches for a window. For reunion island begonia, look for:

If reunion island begonia is stretched, leggy and pale, our guide to leggy, stretched plants covers how to fix it and whether it can be pruned back into shape. Pushing reunion island begonia into a truly dark corner because it is "low-light tolerant" in the catalogue. There is a real difference between tolerating medium light and surviving a sunless corner — in genuine gloom it stretches, sulks and is easy to overwater because it barely drinks.

Where to put reunion island begonia: the best window and room

Reunion Island Begonia is genuinely flexible: a few metres into a bright room, next to a north or east window, or a well-lit hallway all work. Use the read-a-book test — if you can comfortably read there in daytime without a lamp, reunion island begonia will be content. It will take a brighter spot too, as long as it is out of the direct midday beam.

  1. Use the read-a-book test. Stand where reunion island begonia will go in daytime: if you can comfortably read without a lamp, the light level is about right for medium-indirect.
  2. Keep it out of the direct beam. Medium-indirect tolerates a lot but not hours of raw midday sun — set reunion island begonia beside or back from the window, not in the hot beam.
  3. Avoid the truly dark corner. If there is no view of the sky and you would need a lamp by day, that is too dim — move reunion island begonia toward the light or add a small grow light.
  4. Adjust watering with the light. Lower light means reunion island begonia drinks far less; ease off in winter and any dim spell or you will overwater it.

Does reunion island begonia need a grow light?

Because reunion island begonia is happy in moderate light, a modest grow light easily covers a dim room: an inexpensive full-spectrum LED run 10–12 hours a day is plenty — you do not need the high-output fixtures a sun lover demands. This makes it one of the best choices for a north-facing or windowless room.

The seasonal light shift (why winter changes everything)

Even an easy-going plant feels the winter light drop. From November to February, move reunion island begonia closer to its window, ease right off watering (less light means it drinks far less, and the same routine that worked in summer will rot it), and do not feed until the days lengthen and new growth resumes in spring.

Light and watering are linked: a plant in weaker winter light photosynthesises and drinks far less, so the same routine that worked in summer can rot it. See how often to water reunion island begonia for the season-by-season schedule that pairs with this light plan.

Reunion Island Begonia light requirements — frequently asked questions

How much light does reunion island begonia need?

Reunion Island Begonia needs Roughly 150–400 fc — moderate light; reads as "comfortably light room", not "sunny spot". Around 1,500–4,000 lux: bright shade to a gently lit room. A couple of metres from a bright window, beside a north or east window, or anywhere a room feels comfortably light to read in without a lamp during the day.

Can reunion island begonia survive in low light?

No, not really. Reunion Island Begonia is a bright-light plant — in low light it etiolates: it stretches, pales, weakens and slows right down. It will not instantly die, but it steadily declines and never looks its best.

What are the signs reunion island begonia is getting too much light?

Pale, washed-out, or yellowing leaves and dry scorch patches if reunion island begonia sits in direct midday sun for hours — it tolerates medium light, not raw sun. Faded or bleached colour on the most exposed leaves, sometimes with crispy edges. Curling or cupping away from a too-bright window. Pushing reunion island begonia into a truly dark corner because it is "low-light tolerant" in the catalogue. There is a real difference between tolerating medium light and surviving a sunless corner — in genuine gloom it stretches, sulks and is easy to overwater because it barely drinks.

What are the signs reunion island begonia is not getting enough light?

Slow, leggy, stretched growth with longer gaps between leaves as reunion island begonia reaches for the light. Smaller new leaves, a thin and drawn-out look, and lower leaves yellowing and dropping. Soil that stays wet for far too long after watering — a classic side effect of too little light slowing the plant down. If you see this, move reunion island begonia closer to the light or add a grow light — and check our guide on leggy, stretched plants.

Does reunion island begonia need a grow light?

Because reunion island begonia is happy in moderate light, a modest grow light easily covers a dim room: an inexpensive full-spectrum LED run 10–12 hours a day is plenty — you do not need the high-output fixtures a sun lover demands. This makes it one of the best choices for a north-facing or windowless room.

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