Light
Bright Indirect Light
Prefers bright, indirect light or filtered sunlight for optimal stem growth.
Reference image Cereaster bonplandii
Night-Blooming Bonpland Cactus
Overview
Cereaster bonplandii (syn. Harrisia bonplandii) is an exotic, sprawling to climbing cactus species belonging to the family Cactaceae, famous for its magnificent nocturnal flowers 1.
Taxonomy and Naming
Originally described as Cereus bonplandii, this taxon has been placed under both Harrisia and historically Cereaster by different taxonomists 2. The specific epithet honors the French botanist Aimé Bonpland.
Distribution and Habitat
Native to the Gran Chaco region of South America, its range extends across Argentina, Paraguay, Bolivia, and Brazil 1. It typically grows in dry forests and thorn scrub, climbing on surrounding vegetation.
Appearance
The stems are slender, usually 4 to 5-ribbed, grayish-green, and carry small but sharp spines. It produces spectacular, funnel-shaped white flowers that open at night and wilt by morning, followed by bright red, edible globose fruits 2.
Cultivation
It thrives in well-drained, sandy cactus soils and prefers bright indirect light or filtered shade. Water moderately during the hot growing season and keep virtually dry in winter.
Common Cultivation Mistakes
Overwatering combined with poor soil drainage is the leading cause of root rot. Insufficient light leads to thin, weakened stems (etiolation).
Bibliography
References
Watering
10-25 Days
Allow soil to dry out completely between waterings; keep dry in winter.
Soil
Well-draining, sandy and pumice-rich cactus mix
A highly porous mix consisting of pumice, perlite, sand, and organic soil.
Safety
Pet Friendly
Armed with sharp spines; keep out of reach of curious pets and children.
Difficulty
Moderate
Relatively easy to maintain but requires support for its climbing habits.
Native Habitat
South America
Native to the arid forests and open scrublands of the Gran Chaco biome, spanning parts of Argentina, Paraguay, Bolivia, and southwestern Brazil.
Frequently Asked Questions
Can Cereaster bonplandii be grown in indoor pots?
Yes, it can easily be grown indoors in pots placed near airy, bright windows with plenty of indirect light.
How often should I water it?
Water it when the soil is completely dry in summer (about every 10 days). In winter, reduce watering to once every 25-30 days.
What is the best soil mix?
Prepare a high-drainage mix by combining standard cactus soil with plenty of pumice, perlite, and coarse sand.
Does it need direct sunlight?
It should be protected from harsh midday sun, but it thrives in bright, filtered light or morning/evening sun.
When does it bloom?
It produces large white flowers during summer nights. The blooms open after dusk and close by morning.
What is its growth rate?
It grows at a moderate pace under warm conditions; using a stake or trellis is recommended to support its climbing stems.
Is it toxic to pets?
It is non-toxic, but the sharp spines on its stems can cause physical injury to curious pets.
Is it frost hardy?
It can withstand cool temperatures down to 5°C, but it must be strictly protected from frost.
Are the fruits edible?
Yes, the red globose fruits that develop after the flowers fade are edible.
When should I repot it?
Repot in early spring only when the roots have completely filled the pot, moving it to one size larger.