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Field guide
Engelmann's prickly pear (Opuntia engelmannii)
Wikimedia Commons

also Cactus apple

Engelmann's prickly pear

Opuntia engelmannii

Family:
Cactaceae
Elevation:
2,500 ft – 6,500 ft
Bloom:
Apr – Jun
Region:
Southwest

The broad blue-green paddle cactus with yellow-to-orange flowers and edible magenta fruit (tunas). The most widespread prickly pear across southern and central NM.

Care · tuned to the Southwest

Water

Rainfall only once established. Newly planted pads: no water for the first few weeks (let cut edges callus), then very sparingly. Winter watering rots it.

Sun & exposure

Full sun; more sun means more flowers and fruit.

Soil

Sharp-draining sandy or gravelly, alkaline. Never a low, soggy spot.

In the Southwest

Beware glochids — the tiny hair-like spines at each areole detach into skin and are worse than the big spines. Propagates trivially from a single pad laid on dry soil. Fruit and young pads (nopalitos) are edible once de-spined.

Common problems & fixes

  • Cochineal scale — white cottony masses on pads hide sap-sucking insects

    Fix — Blast the cottony masses off with a strong jet of water and repeat; treat stubborn cases with insecticidal soap.

  • Overwatering rot — soft, blackened pads and basal rot from too much moisture

    Fix — Plant in fast-draining soil and withhold irrigation, especially in winter and monsoon humidity.

Pets & toxicity

Not chemically toxic; spines and glochids cause mouth and paw injuries.

Easy to confuse with

  • Plains prickly pear (O. polyacantha) — lower, denser spines
  • Cholla (Cylindropuntia) — cylindrical, not flat, stems

Sources

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