Polka Dot Begonia
Begonia maculata · Spotted Begonia
A cane begonia from the Brazilian Atlantic Forest, with olive angel-wing leaves stippled silver above and flushed deep red beneath. The silver dots are not pigment. They are pockets of air trapped under the leaf surface, which scatter light into spots.
Family
Begoniaceae
Origin
Southeast Brazil
In the wild
Rainforest understory
Indoors
0.5–1 m
Growth
Moderate to fast
With pets
Toxic
Where it's from
The Atlantic Forest of southeast Brazil
Brazilian understory
Native to the shaded, humid Atlantic Forest of Espirito Santo and Rio de Janeiro.
Outdoors: zones 10–11
Tender. Frost kills it, so almost everywhere it lives indoors or as a summer-only patio plant.
A huge genus
Begonia holds roughly 2,000 species, one of the largest genera of flowering plants on Earth.
The dots may be camouflage
The silver spots are not a pigment. They are pockets of air under the leaf surface that scatter light. There is a leading idea for why: the dots may mimic butterfly eggs or leaf-miner damage, fooling insects into thinking the leaf is already taken so they lay their eggs elsewhere. The polka dots may be a no-vacancy sign.
Air, not colour
Blister or airspace variegation, so it cannot revert to plain green.
Once the trout begonia
The polka-dot name only arrived with polka-pattern fabric in the mid-1800s.
It flowers indoors
Dangling clusters of white or pale-pink flowers appear in good light, mainly in summer.
How to keep it
LightBright, filtered
Bright indirect light with shade from hot sun. Too little light means fewer spots and no bloom.
WaterLightly moist
Let the top inch or two dry between waterings. Sensitive to both drought and waterlogging.
HumidityHighWants roughly 45 to 50% and higher. Dry, drafty air is the single most common failure point.
Temperature18–30°COptimum around 19°C. Damage begins below about 15°C. Not frost hardy.
SoilLight, well-drainedAn airy mix with bark or perlite for drainage. It will not tolerate waterlogging.
FeedingLight, in growing seasonA balanced liquid feed every two to four weeks in active growth. Ease off in winter.
DifficultyEasy to moderateEasy to grow but fussy about humidity, and it goes leggy without pruning.
With petsToxicSoluble calcium oxalates. Vomiting and salivation, with the tuber and roots the most toxic part.
PropagationCane cuttingsA non-flowering shoot cut below a node roots very easily in water or soil.
RepottingEvery 1–2 yearsPot up modestly when rootbound and refresh the airy mix.
What the data says
What it costs
Affordable and mass-market, widely stocked by big growers and box stores.
$8–40
Commonly around $20 for a young plant. Because the dots are structural, not chimeral, there is no high-value collector form, so prices stay modest.
IUCN · Not assessed
In the wild
Thriving on millions of shelves while its home forest is among the most cleared on Earth.
Begonia maculata itself is not flagged as threatened. But its home, the Brazilian Atlantic Forest, has lost well over 85% of its original cover and the rest is heavily fragmented. Many of its narrow-range begonia relatives are imperilled. Thriving on our shelves while its forest disappears.
When it sulks
Leaf drop, crispy edgesLow humidity or dry drafts. The number-one complaint: a rainforest plant in dry house air.
Powdery mildewStagnant, humid but poorly ventilated air. It needs airflow.
Leggy, floppy canesToo little light and no pruning. Pinch to keep it bushy and stake tall canes.
Yellow leaves, stem rotOverwatering and soggy mix.
Fewer spots, no flowersNot enough light.
Varieties & company
The varieties
WightiiAngel Wing hybrids
Pairs with · keep apart from
CalatheaFernsPeace LilySnake PlantCactiAloe
A new plant, every week.
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