African Violet
Streptocarpus ionanthus · Usambara Violet
It grows as a small fuzzy rosette in the shaded cloud forests of Tanzania's Usambara Mountains. It is not a true violet at all, and as of 2012 it is not even a Saintpaulia: DNA buried it inside the genus Streptocarpus.
Family
Gesneriaceae
Origin
Tanzania
Cultivars registered
16,000-plus
Indoors
15–23 cm
Growth
Slow to moderate
With pets
Safe
Where it's from
Eastern Tanzania and southeastern Kenya
Cloud-forest rosette
Shaded, humid mountain slopes in the Nguru and Usambara ranges of eastern Tanzania.
Outdoors: zones 11–12
Tropical only. Frost-tender and scorched by direct sun, so almost everywhere it lives indoors.
Near Threatened
The wild plant is in decline, and several of its subspecies are Endangered, from habitat loss.
Botanically homeless
The genus Saintpaulia was named in 1893 for Baron von Saint-Paul, who collected it in the Usambaras around 1892. Then molecular work showed it was nested deep inside Streptocarpus, the Cape primroses, and the genus was sunk in 2012. The plant on millions of windowsills lost the name it was famous under.
Not a true violet
It only resembles the genus Viola. The name is purely a look-alike.
16,000-plus cultivars
Registered over the decades by the African Violet Society of America.
One leaf, one plant
A single leaf cutting reliably makes a whole new clone, which is how it spread.
How to keep it
LightBright, indirect
No direct midday sun, which scorches the leaves. It needs 10 to 12 hours of light to bloom.
WaterLightly, evenly moist
Water from below with tepid water and never wet the fuzzy leaves. Standing water rots the crown.
HumidityModerate to highLikes 50 to 70 percent. Do not mist, as wet leaves invite mould and spotting.
Temperature16–24°CWarm and steady year-round. Avoid cold drafts, cold windows and sudden swings.
SoilLight, peat-based mixFree-draining. African-violet mixes are sold ready-made.
FeedingDilute, in growthA weak balanced feed every three to four weeks in spring and summer, eased off in winter.
DifficultyEasy to moderateForgiving and long-lived, as long as the leaves stay dry and the soil never sits wet.
With petsSafeNon-toxic to dogs, cats and horses per the ASPCA. The fertiliser, not the plant, is the hazard.
PropagationLeaf cuttingsA full-size leaf with its stalk roots plantlets in four to five weeks. Chimeras need suckers.
RepottingEvery 2–3 yearsInto a pot only slightly larger. Oversized pots suppress flowering.
What the data says
What it costs
A cheap supermarket commodity, mass-cloned from leaves by the million, with a deep collector layer behind it.
$5–15
Named chimeras, fancy variegates and show cultivars run $15 to $50 and up. No Monstera-style bubble; premiums stay modest.
The clean-air myth
It gets called an air-purifying plant. It was never even in the study that started the idea.
1 African Violet cleans 0.1% of one room's air
The African violet was not one of NASA's 1989 sealed-chamber species, so the lab claim never applied to it. In a real room you would need hundreds to match one open window. Keep it because it blooms.
IUCN · Near Threatened
In the wild
The same plant is everywhere and nowhere: billions of clones indoors, a fading ancestor in the forest.
Billions of leaf-cloned descendants sit on windowsills worldwide, while the wild Streptocarpus ionanthus is assessed Near Threatened and several subspecies are Endangered, squeezed into a shrinking patch of East African mountain forest. Thriving in our homes, vanishing in the wild.
When it sulks
Mushy centre, collapsing leavesCrown and root rot from overwatering, deep planting or cold standing water. The top killer.
Pale rings on the leavesCold water or droplets sitting on the fuzzy foliage. Water from below with tepid water.
Won't flowerToo little light, low humidity, or a pot that is too large.
Leggy with a bare neckNot enough light. Repot deeper to refresh the crown.
Distorted centre growthCyclamen mites, a classic African violet pest. Also watch for mealybugs and aphids.
Varieties & company
The varieties
OptimaraRhapsodieTrailing typesVariegated foliageChimera
Pairs with · keep apart from
Moth OrchidPeace LilyFernsSnake PlantCactiAloe
A new plant, every week.
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