Light
Full Sun
Requires full sun, ideally 6+ hours of direct sunlight daily to maintain dense spine growth.
Reference image 
Reference image Cylindropuntia alcahes
Alcahes Cholla
Overview
Cylindropuntia alcahes is a highly spiny, shrubby cactus species belonging to the family Cactaceae. Famously adapted to hyper-arid conditions, this species is noted for its tough, architectural form and extreme drought tolerance 1.
Taxonomy and Naming
Originally described by Weber, it is classified under the genus Cylindropuntia, commonly known as cholla cacti. Locally in Mexico, it is known as 'Alcahes', referring to its traditional regional presence 1.
Distribution and Habitat
This species is primarily endemic to the Baja California Peninsula of Mexico. It thrives in desert environments, rocky slopes, and sandy alluvial plains, where it endures high temperatures and intense sunlight 2.
Appearance
It grows as a heavily branched, shrubby cactus. The stems consist of cylindrical, easily detached joints. These joints are densely covered in sharp, barbed spines encased in papery sheaths. Its flowers are typically greenish-yellow, occasionally tinged with red, followed by spiny fruits 2.
Cultivation
In cultivation, it requires very little maintenance. It must be grown in full sun and perfectly drained, sandy or gravelly soil. Overwatering is the primary threat, and watering should be minimal during winter months.
Common Cultivation Errors
The most frequent mistake is waterlogged soil, which rapidly causes root rot. Placing the plant in low-light indoor environments leads to weak, stretched growth (etiolation) and loss of vigor.
Bibliography
References
Watering
12-30 Days
Water only when the soil is dry. Avoid wet soil at all costs, especially in winter.
Soil
Well-draining, sandy and gritty cactus soil mix
Requires an extremely porous mineral mix containing pumice, coarse sand, and perlite.
Safety
Contact/Ingestion Risk
Armed with very sharp, barbed spines that easily attach to skin and clothing. Handle with care.
Difficulty
Moderate
Moderate. It is very easy if kept dry and sunny, but highly sensitive to overwatering.
Native Habitat
Mexico (Baja California)
Native to the arid desert regions and rocky hillsides of the Baja California Peninsula in Mexico, where it forms dense, spiny shrub communities.
Frequently Asked Questions
Can Alcahes Cholla be grown indoors?
It is difficult due to its high direct sunlight requirements. It can only be grown indoors on very bright south-facing windowsills or on balconies.
How often should it be watered in a pot?
Water only when the soil is completely dry, roughly every 10-14 days in summer, and once a month or not at all during winter.
Which potting soil should be used?
Use a specialized cactus soil containing plenty of pumice, lava rock, and coarse sand for enhanced drainage.
Are its spines dangerous?
Yes, they are barbed and extremely sharp. They easily attach to skin upon contact and can be painful to remove; use tweezers if necessary.
Is it toxic to pets?
While not chemically toxic, its extremely sharp, barbed spines pose a serious risk of physical injury to pets.
How fast does it grow?
It is a slow to moderate grower. It can develop a few new stem joints per year when provided with optimal sun and watering.
Does it bloom?
Yes, mature plants produce yellowish-green flowers during late spring and early summer.
Is it cold hardy?
It can tolerate brief, light frosts (down to -5°C/23°F) if kept completely dry, but protection is recommended.
When should it be repotted?
Repot every 2-3 years in spring, using thick leather gloves or tongs to handle the plant safely.
How do you propagate it?
It is easily propagated by taking stem joints (cuttings), letting them callus for a few days, and planting them in sandy soil.