Bunny Ear Cactus
Opuntia microdasys · Polka-Dot Cactus
It grows on rocky, sun-blasted ground in the high desert of Mexico, stacking flat oval pads pad-on-pad. It has no scary spines. Instead each velvety polka-dot is a tuft of tiny barbed hairs called glochids, finer than a human hair, that detach at the lightest touch.
Family
Cactaceae
Origin
Mexico
In the wild
Rocky desert
Indoors
0.3–0.6 m
Growth
Slow
With pets
Non-toxic
Where it's from
Central and northern Mexico
Mexican high desert
Native and endemic to central and northern Mexico, on rocky, fast-draining ground.
Outdoors: zones 9a–11b
Frost-tender. A summer patio plant at most, brought in before frost.
Naturalised in Africa
Recorded as a weed in Kenya, Malawi and Tanzania, where dropped pads root where they fall.
The polka-dots bite
Each soft-looking dot is a tuft of glochids, barbed hairs thinner than the thinnest human hair that detach at the lightest touch and embed in skin, paws, gums and eyes. The plant the ASPCA calls non-toxic is one of the worst houseplants to actually pet.
Mechanical, not chemical
It carries no poison. The whole hazard is the barbed hairs.
Hard to remove
Lodged glochids can be lifted with tape or a peeled layer of dried white glue.
Handle with tongs
Use thick gloves, newspaper or tongs whenever you move or repot it.
How to keep it
LightFull sun to bright
Six or more hours of strong light. It will not flower without it.
WaterOnly when bone dry
Soak then let it dry completely. Overwatering and rot is the main killer.
HumidityDry air is fineThrives in dry indoor air. No misting.
TemperatureWarm, cool winter restA cool dry rest around 10–18°C in winter. Not frost-hardy.
SoilCactus / succulent mixGritty and fast-draining, never water-retaining. Acid to neutral pH.
FeedingBarelyA light cactus feed in the growing season only.
DifficultyEasyDrought-tolerant and beginner-friendly, as long as you keep it dry.
With petsNon-toxicNo poison, but the barbed glochids are a contact hazard. Keep it out of paw reach.
PropagationPad cuttingsSnap off a pad with gloves, let it callus a few days, set in dry gritty mix.
RepottingRarelyEvery few years or when crowded. Handle with gloves or tongs.
What the data says
What it costs
Cheap and mass-produced, a big-box and garden-centre staple. No collector bubble.
$5–20
Crested 'monstrose' forms and tidy white albispina specimens run a little higher, roughly $15–40.
IUCN · Least Concern
In the wild
Secure both ways. A Least Concern Mexican native and one of the most mass-propagated cacti on earth.
The whole cactus family is on CITES Appendix II, but artificially propagated Opuntia microdasys is specifically exempt, so nursery plants trade freely while wild-collected cacti need permits. The exemption exists precisely because it is grown by the millions.
When it sulks
Mushy, brown, collapsing padsOverwatering and rot, by far the most common cause.
Shrivelled, wrinkled padsThe rare opposite: too long without any water.
Pale, stretching growthToo little light. Move it somewhere much brighter.
PestsMealybugs and scale, plus fungus gnats in wet soil. Treat early.
No flowers indoorsNormal. It needs maturity and strong direct sun to bloom.
Varieties & company
The varieties
var. pallidavar. albispinavar. undulataCrazy Bunny Ears (monstrose)
Pairs with · keep apart from
AloeSnake PlantBurro's TailMonsteraFernsPeace Lily
A new plant, every week.
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