Light
Full Sun
Requires full sun, preferably at least 6 hours of direct sunlight daily.
Reference image Lophocereus melanurus
Black-tailed Cereus
Overview
Lophocereus melanurus is a striking columnar cactus species belonging to the family Cactaceae. Known for its distinct pseudocephalium and nocturnal blooms, it is a prized specimen among succulent enthusiasts and botanical collectors 1.
Classification and Naming
Classified under the genus Lophocereus, this species has been previously placed in Pachycereus and Bergerocactus. The specific epithet 'melanurus' derives from Greek, meaning 'black tail', referring to the dark, bristly spine clusters that develop on mature stems 2.
Origin and Habitat
This species is endemic to southern Mexico, specifically found in the states of Guerrero, Oaxaca, and Michoacán. It typically grows on rocky slopes and within deciduous tropical dry forests 1.
Appearance
Lophocereus melanurus exhibits a shrubby to tree-like habit with branched, ribbed green stems. Mature branches develop a terminal pseudocephalium characterized by dense, dark-bristled, hair-like spines. The tubular flowers are pinkish-white and open at night, adapted for nocturnal pollinators 2.
Cultivation
It requires full sun exposure and extremely well-draining mineral soil. Water thoroughly during the active growing season only when the soil has dried out completely. During winter dormancy, keep the plant dry and protect it from freezing temperatures 1.
Common Cultivation Mistakes
Overwatering and poor soil drainage are the primary causes of root rot. Lack of adequate sunlight will cause the stems to stretch (etiolate) and weaken the overall structure of the cactus.
References
Watering
10-30 Days
Water only when the soil is completely dry. Keep almost bone-dry in winter.
Soil
Well-draining, pumice-rich cactus mix
Needs an extremely porous mineral mix consisting of pumice, perlite, and coarse sand.
Safety
Pet Friendly
Sharp bristles can irritate the skin. Keep away from pets and children.
Difficulty
Moderate
Moderately easy if overwatering is strictly avoided and bright light is provided.
Native Habitat
Mexico (Guerrero, Oaxaca)
Native to the dry tropical forests and rocky arid slopes of southwestern Mexico, thriving in warm, sun-drenched habitats.
Frequently Asked Questions
Can Lophocereus melanurus be grown in a pot?
Yes, it can be successfully grown in pots with drainage holes using a highly porous cactus soil mix.
When do the black tail-like spines develop?
These black, hair-like bristles (pseudocephalium) develop on the tips of the branches once the cactus reaches maturity.
How often should I water in summer?
On average every 10 days depending on temperature, but always ensure the soil is completely dry before watering.
How should I water in winter?
During winter dormancy, water very sparingly once a month, or keep completely dry if kept in a cool location to prevent rot.
What type of soil does it prefer?
It prefers extremely well-draining, non-calcareous cactus soil enriched with pumice, perlite, and river sand.
Is it toxic to pets?
It is non-toxic, but the sharp spines pose a physical injury hazard to curious pets.
When and how does it bloom?
In summer, pinkish-white flowers bloom at night from the woolly pseudocephalium on mature stems.
How fast does it grow?
Like many columnar cacti, it has a slow to moderate growth rate, and its height remains manageable in indoor pots.
Does it need direct sunlight?
Yes, it needs at least 6 hours of direct sunlight daily to maintain its structural form and healthy spine development.
Is it frost hardy?
It is sensitive to frost. It should be kept dry and sheltered where temperatures do not drop below 5°C (41°F).