Light
Bright Indirect Light
Bright indirect light or partial morning sun. Avoid scorching afternoon sun.
Reference image Harrisia bonplandii
Bonpland's Harrisia
Overview
Harrisia bonplandii is an exotic, night-blooming succulent subshrub belonging to the family Cactaceae. Known for its sprawling or climbing habit, it often relies on surrounding vegetation for structural support in its native habitats 1.
Taxonomy and Naming
The species is named in honor of the French botanist Aimé Bonpland. It has been historically classified under several synonyms, including Cereus bonplandii and Eriocereus bonplandii. The genus name Harrisia honors William Harris, an Irish botanist who served as Superintendent of Public Gardens in Jamaica 2.
Distribution and Habitat
Native to southern South America, this species is widely distributed across Brazil (including Mato Grosso do Sul and Rio de Janeiro), Paraguay, Bolivia, and northern Argentina. It thrives primarily in seasonally dry tropical biomes, deciduous forests, and the scrublands of the Gran Chaco 1.
Appearance
The stems are dark green or grayish-green, typically featuring 4 to 5 ribs, and can reach several meters in length. Areoles bear sharp, needle-like grayish spines. Its most striking feature is the large, funnel-shaped white flowers, measuring up to 25 cm long, which open at night and emit a sweet fragrance. The subsequent fruits are edible, globose, and bright red when ripe 2.
Cultivation
Harrisia bonplandii prefers bright, indirect light or filtered sunlight. It requires highly porous, mineral-rich, and well-draining soil. Water thoroughly during the active summer growing season, and keep the substrate completely dry during the winter dormancy period.
Common Cultivation Mistakes
Overwatering is the most critical issue, rapidly causing root rot. Insufficient light leads to weak, etiolated stems that cannot support their own weight. Cold, damp winter environments must be strictly avoided.
Bibliography
References
Watering
7-21 Days
Water moderately during spring and summer; keep almost completely dry in winter.
Soil
Well-drained, sandy cactus soil mixed with pumice and fine gravel
Highly porous cactus mix containing gravel, pumice, and coarse sand.
Safety
Risky for Pets
Features sharp spines that require careful handling. Keep away from pets due to mild sap toxicity.
Difficulty
Moderate
Moderate care. Requires careful winter water management to prevent rot.
Native Habitat
Southern South America
Mainly distributed in Brazil, Paraguay, Bolivia, and Argentina, occurring in dry forests and shrubby savannas.
Frequently Asked Questions
Can Harrisia bonplandii be grown in a pot?
Yes, it can be grown successfully in deep, well-draining pots. However, as it grows, its sprawling stems will require a trellis or stake for support.
When and how does it bloom?
It blooms during the summer nights. The large, fragrant white flowers open after dusk and wither by the next morning.
Is it toxic to pets?
Yes, the sharp spines pose a physical danger, and the plant sap can cause gastrointestinal irritation if chewed by pets.
How often should it be watered?
Water roughly once a week in summer after the soil dries out, and reduce watering to once every 3-4 weeks during winter.
What soil mix should be used?
An open, fast-draining cactus mix containing pumice, lava rock, and coarse grit is ideal to prevent water retention.
Is it a fast-growing cactus?
Compared to other cacti, it is relatively fast-growing, capable of adding 30-50 cm of stem length per year under optimal conditions.
Are the fruits edible?
Yes, the mature, bright red globose fruits are sweet and edible.
Is it cold hardy during winter?
It is frost-sensitive. It is recommended to keep the temperature above 5°C (41°F) during winter.
Why are the stems growing thin and stretched?
This is a sign of light deficiency (etiolation). Move the plant to a brighter location with indirect sunlight.
How do you propagate Harrisia bonplandii?
It can be easily propagated by taking stem cuttings in spring or summer, letting them callous for a few days, and planting them in dry sand.