Lithops
Lithops · Living Stones
It grows in the arid, rocky deserts of southern Africa, its swollen body sitting flush with the ground and mostly buried. It evolved to look like a pebble so grazing animals walk straight past it.
Family
Aizoaceae
Origin
Southern Africa
In the wild
Buried in desert gravel
Indoors
2–4 cm bodies
Growth
Very slow
With pets
Non-toxic
Where it's from
Namibia and South Africa
Desert camouflage
Arid rocky ground in Namibia and South Africa, where rainfall ranges from modest down to near-zero.
Nearly a thousand stands
Almost 1,000 individual wild populations have been documented across its range.
Outdoors: zones 10–11
Tender and frost-sensitive. A houseplant or under-glass plant in colder climates.
It hides as a rock
To avoid being eaten in the open desert, Lithops mimics the pebbles around it, buried body and stone-coloured top with a translucent window that lets light down to the photosynthetic tissue below. The disguise works so well that new species keep turning up hidden in plain sight, and each year the plant digests its own old leaves to grow the next pair.
New species, still found
Hidden by their own camouflage, fresh species keep being described, including L. coleorum in 1994 and L. amicorum in 2006.
It eats its old leaves
A new leaf-pair grows from the fissure and absorbs the water and nutrients of the old pair, which shrivels to a husk.
Light through a window
Translucent cells on top let light into the buried body for photosynthesis below the surface.
How to keep it
LightVery bright, direct
Five or more hours of sun. Too little light leaves the bodies stretched and pale.
WaterAlmost none
Water sparingly in active growth, almost dry in winter and during leaf renewal. Soak and dry, never moist.
HumidityDry air is fineLow humidity, no misting. It came from the desert.
TemperatureRoom temperatureKeep above about 10°C. Not frost-hardy.
SoilGritty cactus mixVery fast-draining, with extra grit or pumice, in a deep pot for the long taproot.
FeedingBarelyAt most a dilute feed during active growth. Succulents need very little.
DifficultyEasy if left dryDrought-loving and tough, but unforgiving of overwatering and wrong-season watering.
With petsNon-toxicListed non-toxic to cats, dogs and horses. Large amounts of any plant can still cause mild stomach upset.
PropagationSeedMainly from seed. An established clump can be divided once it naturally splits. Leaf cuttings do not work, the leaves are the whole plant.
RepottingRarelyOnly when the clump crowds the pot, roughly every four years.
What the data says
What it costs
Common as a generic living stone, but specific wild-type species and locality forms are genuinely scarce.
$5–20
Named collector forms like L. optica 'Rubra' command a premium and sell slowly because they are scarce and very slow-growing. Seeds are cheap.
IUCN · Varies by species
In the wild
The sharpest home-versus-wild story on the shelf, and a notable gap in protection.
Lithops is assessed species by species, from Least Concern to Critically Endangered, and about half of South Africa's species are considered at risk. Wild plants are torn from the gravel by poachers feeding the houseplant trade, a problem that rose sharply from around 2021. Yet the genus carries no CITES protection at all. Your windowsill plant is almost certainly seed-grown, which is the ethical choice.
When it sulks
Soft, mushy, splitting bodyRoot or body rot from overwatering or watering in the wrong season. By far the most common death.
Stretched, tall, pale bodyToo little light.
Wrinkled, sunken bodyOften normal water-thrift before renewal, sometimes genuine underwatering in growth. Check the season first.
Two sets of leaves stacked upThe new pair did not fully absorb the old, usually from watering during renewal.
PestsMealybugs and scale, plus fungus gnats and rot if the soil stays wet.
Varieties & company
The varieties
AucampiaeSalicolaKarasmontanaSchwantesiiOptica 'Rubra'
Pairs with · keep apart from
Split RockConophytumCactiCalatheaFernsPeace Lily
A new plant, every week.
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