Croton
Codiaeum variegatum · Joseph's Coat
It grows as a woody shrub in the wet tropics of Malesia and the Pacific islands. Every blazing colour on its leaves is made by pigment, not by flowers. Bright light deepens the colour; shade turns it plain green.
Family
Euphorbiaceae
Origin
Malesia and Pacific
Colour from pigment
Not one flower
Indoors
0.6–1.2 m
Growth
Slow to moderate
With pets
Toxic
Where it's from
Malesia to the southwest Pacific
Wet-tropics shrub
Open forests, thickets and forest margins across Borneo, the Philippines, New Guinea and the Pacific islands.
Outdoors: zones 11–12
Frost-free only. A summer patio plant at most, brought in before nights drop below 10°C.
Not invasive
An ornamental that stays where it is planted, a Florida and Caribbean hedge staple.
All colour, no flower
The green, yellow, orange, red, pink, bronze and purple all come from three pigments: chlorophyll, carotenoid and anthocyanin. Brighter light builds the colour, and shade lets green take back over. The tiny cream flowers it does make are easy to miss.
300-plus cultivars
Leaf shapes run from oval to lance, oak-leaf, narrow and even spirally twisted.
Colour needs light
In too much shade the leaves revert toward plain green and the lower ones drop.
It bleeds white
A true spurge, it leaks milky latex when cut, the source of its toxicity.
How to keep it
LightBright, some direct sun
The brighter the light, the bolder the colour. Too much shade fades it to green.
WaterKeep evenly moist
Let the top half-inch dry, never soggy. It also drops leaves if it dries out fully.
HumidityModerate to highDry indoor air browns the leaf edges and invites spider mites.
Temperature15–29°CNot frost-hardy. Leaf drop and damage below about 10°C, and it hates cold drafts.
SoilRich, well-draining mixHumus-rich and free-draining. It will not sit in standing water.
FeedingSpring and summerA balanced feed through the growing season, little to none in winter.
DifficultyModerate to fussyNotorious for dramatic leaf drop after a move, a draft or a watering swing.
With petsToxicThe milky latex sap. Drooling, vomiting, diarrhea and skin irritation if chewed.
PropagationCuttings or air-layeringStem-tip cuttings in summer, air-layering for woody stems. Seed loses the colour.
RepottingEvery 1–2 yearsWhen rootbound. Refresh the soil and size up gradually.
What the data says
What it costs
A mass-produced foliage plant. Loud to look at, easy on the wallet, with no collector bubble.
$10–35
Common cultivars like Petra, Mammy and Gold Dust are cheap and everywhere. Twisted and large forms carry only a modest premium.
The clean-air myth
Crotons get swept onto air-purifying lists. The number behind that claim is brutal.
1 Croton cleans 0.1% of one room's air
You would need hundreds of plants to make a measurable dent. The famous 1989 NASA result came from a sealed lab box, and a real room's airflow beats any plant. Keep it for the colour.
IUCN · Least Concern
In the wild
Widespread, abundant and heavily cultivated. In no danger anywhere.
One of the most-grown tropical foliage plants on earth, with a broad native range across Malesia and the Pacific. An ornamental success story, equally at home as a Pacific-island hedge or a windowsill pop of colour.
When it sulks
Sudden leaf dropThe croton signature. A move, a cold draft, or a swing in watering, too wet or too dry.
Faded, all-green leavesNot enough light. The colours only develop in bright light.
Brown, crispy edgesDry air, low humidity or underwatering.
Lower leaves droppingToo much shade.
PestsSpider mites in dry air, plus mealybugs and scale. Wipe and inspect the glossy leaves.
Varieties & company
The varieties
PetraMammyGold DustEleanor RooseveltSpirale
Pairs with · keep apart from
Rubber PlantDracaenaDieffenbachiaSnake PlantCactiSucculents
A new plant, every week.
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