Bunny Ears Cactus

Opuntia microdasys is endemic to central and northern Mexico.

• Found in the states of Hidalgo, Querétaro, San Luis Potosí, Tamaulipas, and Puebla
• Occurs at elevations of approximately 600 to 1,800 meters
• Grows in semi-arid to arid environments on rocky hillsides, scrubland, and thorn forest
• The region experiences hot summers, mild winters, and seasonal monsoon rainfall
• First described by the German botanist Michael Joseph François Scheidweiler in 1837
• Widely naturalized in parts of the Mediterranean, Australia, and South Africa due to horticultural escape
• The species has been cultivated in European botanical gardens since the mid-19th century

A shrubby, freely branching cactus forming dense thickets up to 40 to 100 cm tall.

Pads (Cladodes):
• Flat, oval to elliptical, typically 10 to 20 cm long and 7 to 12 cm wide
• Bright green, soft, and relatively thin compared to other Opuntia species
• New pads emerge vertically from the upper edges of mature pads

Areoles:
• Evenly spaced across the pad surface in a diagonal pattern
• Each areole bears a dense tuft of 15 to 30+ glochids, 3 to 6 mm long
• Glochids are barbed, golden yellow to brown (in the type form) or white (in the albispina form)
• True spines are usually absent or reduced to 1 to 2 short, weak spines

Flowers:
• Bowl-shaped, 4 to 6 cm in diameter
• Lemon yellow, sometimes with a reddish tinge on the outer petals
• Appear along the upper margins of pads in spring to early summer

Fruit:
• Fleshy, oblong to globular, 2 to 4 cm long
• Green to yellowish-green, sometimes tinged red
• Edible but spiny, containing pale seeds

Occurs in semi-arid scrubland and thorn forest habitats.

• Forms dense thickets that provide shelter for small mammals, reptiles, and insects
• Flowers are visited by a wide range of pollinators including bees, beetles, and butterflies
• Fruits are consumed by birds and small mammals, which disperse the seeds
• Pads can take root when detached and in contact with soil, enabling vegetative spread
• Adapted to seasonal drought; pads store water and can shrivel during extended dry periods
• Provides nesting sites for cactus wrens and other desert birds

Opuntia microdasys possesses glochids — tiny, barbed bristles that are among the most effective defensive structures in the plant kingdom.

• Glochids are 3 to 6 mm long, barbed, and detach from the areole at the slightest touch
• They easily penetrate skin, clothing, and even leather gloves
• Once embedded, glochids are extremely difficult to remove due to their backward-facing barbs
• Glochid injuries cause intense irritation, dermatitis, and can lead to secondary infections if not removed
• Cases of glochid injury to eyes have been documented and can be medically serious
• To handle safely: use thick rubber gloves, tongs, or wrap the plant in several layers of newspaper
• Embedded glochids can sometimes be removed using adhesive tape, white glue peel, or tweezers under magnification

Light:
• Thrives in full sun to bright, filtered light
• Adequate light promotes compact pad growth and dense glochid production
• Etiolation (thin, stretched pads) indicates insufficient light

Soil:
• Requires well-draining soil; standard cactus mix with added perlite or pumice works well
• Tolerates poor, sandy, and rocky soils
• Avoid heavy, water-retentive soils

Water:
• Water moderately during the growing season when the soil is completely dry
• Reduce to minimal watering in winter
• Overwatering causes pad discoloration, soft rot, and fungal issues

Temperature:
• Hardy to approximately -5°C for short periods if kept dry
• Best growth at 18 to 30°C
• Protect from prolonged frost and freezing conditions

Propagation:
• Extremely easy from pad cuttings
• Allow cut surface to callus for 1 to 2 weeks before placing on dry soil
• Roots typically form within 2 to 4 weeks
• Also propagates from seed, though much slower