Houseplant · Cactaceae
Prickly Pear
Opuntia ficus-indica
Give it sun, sharp drainage, and very little water, and prickly pear practically grows itself.
Full sun
USDA 8–11
3–16 ft · 1–5 m
Overview
Prickly pear is one of the toughest plants you can grow, a paddle-shaped cactus from the Americas that now turns up in warm gardens around the world. The flat green pads are the stems, not leaves, and they store enough water to carry the plant through long dry spells. Grown indoors in a bright window or outdoors in a hot, dry spot, it asks for almost nothing.
It earns its keep twice over. The young pads are eaten as nopales and the ripe red fruit as tunas, both common foods in Mexican and southwestern cooking. The same plant flowers in showy cups of yellow, orange, or pink before the fruit sets in late summer.
The one thing to respect is how it defends itself. Beyond the obvious large spines, every pad carries glochids, tiny barbed bristles that detach at a brush of the hand and lodge in skin, where they are stubborn to remove. Site it away from paths and pets, and never handle it without thick gloves and tongs.
Care
The short version: full sun, a gritty fast-draining mix, and water only when the soil is bone dry. It rots far more easily from too much water than it ever suffers from too little.
Light
Give prickly pear full sun, the brightest spot you have. It will get by with a few hours less, but weak light leaves the pads thin and pale and the plant stretched and floppy.
Water
This is the part that kills most plants. Water deeply but only when the mix is bone dry, and back off hard in the cool months when growth stops. It is very rot-prone, so when in doubt, wait.
Soil
Plant it in a gritty, sharply drained sandy or cactus mix that never stays soggy. A pH anywhere from 6.0 to 7.5 suits it fine, but drainage matters far more than the number.
Temperature
It takes a remarkable range, from about 23°F to 104°F (-5°C to 40°C). That cold tolerance is unusual for a cactus, though hard frost will still damage the pads.
Humidity
Low humidity is exactly what it wants, so dry indoor air is no problem at all. Damp, stagnant air is the real risk, since it invites the rot and pests this plant otherwise shrugs off.
Feeding
Feed only during the spring and summer growth, and keep it light. A dilute, low-nitrogen cactus fertilizer every so often is plenty, since too much nitrogen grows soft, weak pads.
Pruning
Cut out damaged or crowded pads with a clean knife to keep the plant open and healthy. Always wear thick leather gloves and use tongs, because the spines and detaching glochids make bare-handed work a painful mistake.
Repotting
Move it up a pot size only every 2 to 4 years, or once it's badly rootbound and tipping over. Repot into dry mix and wait a few days before watering so any disturbed roots can heal.
Size & spacing
A mature plant can reach anywhere from 3 to 16 feet (1 to 5 m) tall and spread 3 to 10 feet (1 to 3 m) wide. Give it plenty of room, both to grow and to keep its spines well clear of foot traffic.
Troubleshooting
Almost every prickly pear problem traces back to water, with the rest coming down to pests. The pads themselves tell you what's wrong, whether they're going soft, shriveling, or growing fuzzy patches. Match what you see below and act before rot takes hold.
Soft, mushy pads with a blackened base
This is root and stem rot, almost always from overwatering or a pot that holds water. Stop watering, lift the plant, and cut away every soft, discolored section with a clean blade. Let the cuts dry and callus, then replant the firm pads in dry, gritty mix.
Fix:
- Stop watering immediately
- Unpot and cut away all soft, rotted tissue with a clean blade
- Let cuts callus, then repot healthy pads in dry gritty mix
Wrinkled, thin pads that have lost their plumpness
Shriveling points to underwatering or roots damaged by a long drought. Give the plant one deep soak and the pads should plump back up within a day or two. Then let the mix dry out completely before the next watering, and check that the roots underneath are firm rather than rotted.
Fix:
- Water deeply once
- Let the mix dry completely before watering again
- Check that roots are intact and not rotted
White cottony tufts that smear bright red when crushed
Those tufts are cochineal scale, an insect that hides under a waxy coat and bleeds a crimson dye when you press it. Knock the colonies off with a strong jet of water, then treat the pads with insecticidal soap or horticultural oil. Repeat every week or so until the plant stays clean.
Fix:
- Blast off colonies with a strong jet of water
- Treat with insecticidal soap or horticultural oil
- Repeat treatments until clear
Toxicity
There is nothing poisonous about prickly pear. The pads and fruit are everyday foods for people and safe for animals to eat, so a stray nibble won't cause poisoning. The real hazard is physical: the spines and barbed glochids can injure a mouth, paw, or eye, so keep pets and children clear and handle the plant with care.
Safe for
People · Cats · Dogs · Horses · Rabbits · Livestock · Birds
Cats Non-toxic
Nothing in the plant will poison a cat, so the flesh itself is safe. The risk is purely physical: a curious cat that bats at a pad can pick up spines or fine glochids in the paw, lip, or tongue.
Dogs Non-toxic
A dog can chew or even swallow a piece with no chemical harm. What does hurt is the spines and the barbed glochids, which catch in the mouth and gums and are a misery to pull out.
Horses Non-toxic
Horses graze prickly pear with no sign of poisoning, and singed pads are fed to stock in dry country. Raw spines and glochids are the catch, since they lodge in the lips and mouth.
Rabbits Non-toxic
The pads are safe to nibble and hold no toxin. Trim away every spine and glochid first, because a rabbit's soft mouth has no defense against the barbs.
Livestock Non-toxic
Cattle, goats, and sheep eat prickly pear readily, and ranchers burn off the spines to make it safe winter feed. Left untreated, the spines and glochids damage the mouth and gut.
Birds Non-toxic
Birds feast on the ripe fruit and spread the seeds, with no poisoning at all. Only the spines and glochids pose any threat, so they keep to the soft, ripe pulp.
People Non-toxic
Both the pads, sold as nopales, and the fruit, the tunas, are common foods that are perfectly safe to eat. The only hazard is handling: scrub or singe off the spines and glochids before they reach skin or mouth.
The real danger is physical, not chemical: besides large spines, prickly pear bears glochids, tiny barbed bristles that detach easily and lodge painfully in skin, eyes, and mouth, where they are very hard to remove. Always handle with thick gloves and tongs.
Varieties
Opuntia is a large group, and a few forms show up far more than the rest. These are the ones you're most likely to meet.
Opuntia ficus-indica (spineless forms)
These are the near-spineless cultivars grown commercially for nopal pads and tuna fruit, though even the smooth-looking ones still carry glochids you have to scrub off.
Opuntia microdasys (bunny ears)
A small, popular houseplant whose soft-looking pads are packed with dense clusters of white or yellow glochids, making it far pricklier than it appears.
Opuntia stricta
An upright prickly pear best known as an aggressive invasive weed across parts of Australia and Africa.
How to propagate
Prickly pear is about as easy to multiply as a plant gets, and a single pad is usually all you need.
Stem cuttingsEasy
Spring to summer · 4 to 8 weeks to root
Rooting a pad is the easy way, and spring through summer is the time to do it. Twist off a healthy pad, let the cut end dry and callus over for several days, then stand it upright in dry, gritty mix where it will root in 4 to 8 weeks. Wear thick gloves the whole time, since the glochids are waiting.
SeedModerate
Spring · Several months to a year
Growing from seed in spring is the slow road. The seeds sprout unevenly and a plant can take several months to a year to get going, so most people simply root a pad instead.
Myths
A spiky cactus like prickly pear must be poisonous.
Prickly pear is not toxic, and people across the world eat it every day. The pads are sold as nopales and the fruit as tunas, both kitchen staples. The only real danger is the spines and glochids, not any poison inside the plant.
A pad with no big spines is safe to grab bare-handed.
The large spines are easy to see, but they aren't the worst part. Smooth-looking pads are still studded with glochids, tiny barbed bristles that pull free at a touch and bury themselves in your skin. Always handle prickly pear with thick gloves and tongs, spines or not.