Espostoopsis dybowskii – Rare Night-Blooming Columnar Cactus


Espostoopsis dybowskii (Rol.-Goss.) Buxb. is a remarkable columnar cactus and the sole species in its genus. Endemic to Brazil, it forms clusters of erect, unbranched stems that branch mainly near the base, giving rise to tall, slender columns. Its white, bell-shaped flowers open at night, releasing a delicate fragrance to attract nocturnal pollinators. While not the easiest cactus for beginners, it rewards attentive growers with relatively fast growth compared to many cereoid cacti.
 
● Why Collectors Value Espostoopsis dybowskii


Genus Rarity: The only species of Espostoopsis, making it botanically unique.
Growth Habit: Multi-stemmed, erect columns with a striking, architectural presence.
Blooming: White, tubular flowers open at night with subtle fragrance.
Performance: Faster-growing than many other columnar cacti when given ideal conditions.
 
● Natural Habitat and Origin


This species is native to Minas Gerais, Brazil, where it grows on rocky slopes and hillsides in tropical savanna climates. Its night-blooming flowers are adapted to moth pollinators, while the tall, ribbed stems enable efficient water storage and survival during seasonal droughts. Its restricted distribution adds to its rarity in cultivation.
 
● Caring for Espostoopsis dybowskii


Light: Requires full sun to partial shade; indoors, place at the brightest available spot.
Watering: Water thoroughly during active growth, but allow soil to dry completely between waterings.
Soil: Plant in a fast-draining mineral-rich mix to prevent root rot.
Temperature: Protect from frost; prefers warm conditions above 10 °C.
Fertilizer: Use diluted cactus fertilizer in the growing season to support column growth.
Container: Provide a deep pot for the root system; avoid frequent repotting.
 
● Challenges in Cultivation


Beginner Difficulty: Sensitive to overwatering and poor drainage.
Frost Intolerance: Not cold-hardy; must be overwintered indoors in temperate climates.
Size Management: Can grow tall, requiring space and support in containers.
 
● Why This Cactus Is Special


Unlike many widely available columnar cacti, Espostoopsis dybowskii holds a unique position as the only representative of its genus. Its combination of rarity, elegant form, and fragrant nocturnal flowers makes it a highlight in serious cactus collections. For growers ready to provide the right conditions, it delivers both botanical significance and ornamental beauty.
 
● Etymology


The genus name Espostoopsis means “resembling Espostoa,” a related Andean cactus genus. The epithet dybowskii honors French naturalist Jean Dybowski (1856 – 1928), known for his botanical and exploratory work.
 
● Frequently Asked Questions


How fast does Espostoopsis dybowskii grow? Relatively fast for a columnar cactus, adding noticeable height each season in good conditions.
Will it flower indoors? Flowering is more likely in mature plants grown in strong light; most flowers open at night.
Can it be grown outdoors? Only in frost-free regions; otherwise keep in pots with winter protection.
Is it grafted? Generally grown on its own roots; grafting is uncommon with this species.
 
● Add Espostoopsis dybowskii to Your Collection


If you’re seeking a columnar cactus with rarity and elegance, Espostoopsis dybowskii is an exceptional choice. With its pure white night blooms and architectural stems, it offers both beauty and botanical distinction. Order now and secure a centerpiece for your advanced cactus collection.