Opuntia diploursina (Double-bear Prickly Pear) Care Guide

Q: Is this plant cold hardy?

Yes, it is extremely cold hardy down to 15 °C (5 °F), provided the soil is kept absolutely dry.

Q: Is it safe for pets?

While non toxic chemically, its numerous fine spines and glochids can cause mechanical injury to pets' paws and mouths.

Q: What kind of soil does it prefer?

It prefers highly porous, mineral heavy soils containing plenty of pumice, lava rock, and coarse sand with very low organic content.

Reference image

Overview

Opuntia diploursina is a densely spined, shrubby cactus species belonging to the family Cactaceae. Famously known as the Double-bear Prickly Pear, this resilient succulent is highly valued by arid-land gardeners for its dense jacket of flexible, glowing spines that resemble animal fur.

Classification and Naming

This species was formally described in 2001 by botanists Marc A. Baker and Jon P. Rebman ¹. The specific epithet "diploursina" translates to "double-bear", referring to its resemblance to the grizzly bear prickly pear (Opuntia erinacea) but displaying distinct taxonomic features.

Origin and Habitat

Opuntia diploursina is native to a narrow range in the Southwestern United States, specifically near the intersection of Utah, Arizona, and Nevada ². It thrives in hyper-arid desert scrublands, gravelly alluvial washes, and rocky slopes at elevations ranging from 500 to 1,300 meters.

Appearance

Growing as an erect or sprawling succulent subshrub up to 1 meter tall, it features flattened elliptical or obovate stem segments (pads). Each pad is heavily armored with numerous, slender, yellow-to-grey spines that obscure the epidermis. It produces bright yellow flowers in late spring, which transition to pinkish hues as they fade, followed by dry, spiny fruits.

Cultivation

In cultivation, it requires full sun and exceptionally well-draining mineral soil. It is highly drought-tolerant and possesses impressive cold-hardiness. If kept completely dry during winter dormancy, it can easily withstand temperatures down to -15 °C.

Common Cultivars and Problems

Overwatering and high atmospheric humidity are the primary causes of failure. In poorly drained soils, root and stem rot develop rapidly. Lack of intense, direct sunlight leads to weak, elongated pad growth (etiolation) and sparse spination.

Bibliography

References

Baker, M. A., & Rebman, J. P. (2001). A New Opuntia (Cactaceae) from the Mojave Desert of Arizona and Utah. Madroño, 48(2), 86-98. ↩
Plants of the World Online (POWO). Kew Science: Opuntia diploursina. http://www.plantsoftheworldonline.org/ ↩

Full Sun

Requires full, direct sun all day to maintain its dense spine coat and prevent stretching.

14-45 Days

Water deeply in summer once soil is bone-dry. Suspend watering entirely in winter.

Extremely well-draining, coarse sandy and gravelly cactus grit mix

Use a strictly mineral-based mix rich in pumice, coarse sand, and grit with minimal organic matter.

Risky for Pets

Armed with countless sharp spines and irritating glochids; keep away from pets and children.

Easy

Very easy to maintain, provided you avoid overwatering and heavy, wet soils.

Southwestern USA (Arizona, Utah, Nevada)

Occurs naturally in the Mojave Desert, colonizing dry gravelly slopes, rocky ledges, and alluvial washes.

Frequently Asked Questions

Can Opuntia diploursina be grown in a pot?

Yes, it grows very successfully in pots provided you use an ultra-draining cactus mix and place it in a sunny location.

How often should I water it?

Water deeply in summer only after the soil has completely dried out (about every 14 days). In winter, withhold water almost entirely.

Is this plant cold hardy?

Yes, it is extremely cold-hardy down to -15 °C (5 °F), provided the soil is kept absolutely dry.

Is it safe for pets?

While non-toxic chemically, its numerous fine spines and glochids can cause mechanical injury to pets' paws and mouths.

What kind of soil does it prefer?

It prefers highly porous, mineral-heavy soils containing plenty of pumice, lava rock, and coarse sand with very low organic content.

How can I encourage it to bloom?

To bloom in spring, it needs a cold and dry winter dormancy period followed by full, direct sun during the growing season.

How fast does it grow?

It is a slow to moderate grower, typically producing only a few new pads (stems) per year.

Is it normal for the pads to wrinkle?

Slight wrinkling in winter is normal due to dryness. In summer, wrinkling indicates either severe dehydration or root rot.

How do you propagate it?

It is easily propagated by taking a pad cutting in spring or summer, letting the cut calloused for a few days, and planting it in dry grit.

Why are the pads growing thin and elongated?

This is a sign of light deprivation (etiolation). Move the plant immediately to a location with more direct, intense sunlight.