The pads are stems, not leaves
What looks like a fleshy leaf on a prickly pear is actually a flattened stem segment called a cladode. The plant has given up leaves almost entirely, and the pads do the work of both leaves and stems.
Pads grow in chains, each new one emerging from the edge of the last. That chain structure is what gives prickly pear its characteristic silhouette, and it is the first thing to describe in a photo.
Two kinds of defence, and the one that hurts
Every prickly pear carries areoles: small spots arranged in a regular pattern across the pad. From those areoles grow either long obvious spines, or dense tufts of tiny barbed bristles called glochids, or both.
Glochids are the hazard. They are millimetres long, they detach at the lightest touch, and they are barbed so they work their way in rather than out. Some species, such as Opuntia microdasys, have no long spines at all and appear harmless. They are the worst of the lot.
Common prickly pears compared
| Species | Pad size and shape | Spines | Fruit | Notes |
|---|---|---|---|---|
| Opuntia ficus-indica | Large, thick, oval pads | Few or none, mostly glochids | Large, edible, yellow to red | The main cultivated edible species |
| Opuntia stricta | Medium, elongated pads | Long, sharp, obvious | Purple-red, edible | A serious weed in many regions |
| Opuntia robusta | Very large, round, blue-grey pads | Few, sometimes none | Large, dark purple | Distinctive glaucous blue colour |
| Opuntia microdasys | Small, rounded pads | None, dense golden glochids | Small, red-purple, rarely set | The most treacherous of the common species |
| Opuntia aurantiaca | Small, narrow pads | Long and very sharp | Small, dry, not edible | Spreads aggressively by detached pads |
Flowers and fruit
- Flowers are large, cup-shaped and carried on the edge of a pad. Colour ranges from yellow through orange to red, depending on the species.
- Opuntia ficus-indica flowers are yellow to orange and appear in late spring or summer.
- The fruit, called a tuna, is a berry that ripens to yellow, orange, red or deep purple depending on the species.
- Fruit shape is useful for identification: ficus-indica fruit is large and barrel-shaped, stricta fruit is smaller and more oval.
- The fruit surface is covered in the same areoles as the pads, which means the fruit carries glochids too.
Handling prickly pear safely
- Never handle any part of the plant with bare hands, including the fruit. Glochids go straight through thin fabric.
- Use kitchen tongs or leather gloves to move pads and pick fruit.
- To prepare fruit, hold it with tongs and rub it under cold running water to dislodge the glochids, then peel it without touching the skin.
- To remove glochids from skin, do not squeeze them. Spread a layer of craft glue or wax over the area, let it set, and peel it off. Tweezers make it worse.
- Never plant prickly pear in a garden near a path or a boundary. Several species are declared weeds because detached pads root wherever they land.
Prickly pear is the name for a group of cacti in the genus Opuntia, and they are among the easiest cacti to recognise at a glance. Their flat, pad-like stem segments are unlike anything else in the plant kingdom.
The identification is the simple part. What catches people out is handling: prickly pears carry two entirely different kinds of defence, and the one that causes the most misery is the one you can barely see.
Frequently Asked Questions
Look for flat, oval stem segments joined end to end in chains. No other common cactus has that shape. Then check the areoles for long spines or dense tufts of fine bristles to narrow down the species.