Light
Bright Indirect Light
Enjoys plenty of bright, indirect sunlight, but protect from intense midday summer sun to avoid scorching.
Reference image Acanthocereus lempirensis
Lempira Spiny Cactus
Overview
Acanthocereus lempirensis is a rare and distinctive succulent subshrub or shrub belonging to the family Cactaceae. It thrives in seasonally dry tropical biomes, exhibiting a sprawling or semi-erect growth habit suitable for collectors of exotic cacti.
Taxonomy and naming
The species epithet 'lempirensis' refers directly to its origin in the Lempira department of Honduras. The genus Acanthocereus is characterized by its heavily ribbed, nocturnal-blooming stems, making this species an essential taxon for understanding Central American succulent diversity 1.
Distribution and habitat
This species is primarily native to Honduras in Central America. It inhabits dry tropical forests and rocky slopes, where it has adapted to survive prolonged dry seasons by storing water in its ribbed, fleshy stems 2.
Appearance
Acanthocereus lempirensis features green to grayish-green branches with 3 to 5 prominent ribs. Spines are stout, sharp, and arranged along the areoles. Its large, nocturnal, funnel-shaped white flowers are designed to attract night-pollinating insects.
Cultivation
In cultivation, it requires a coarse, fast-draining mineral substrate and a pot with ample drainage. Water thoroughly during the summer only when the substrate is completely dry, and maintain dry conditions during the cold winter resting phase.
Common cultivation mistakes
The most critical mistake is overwatering, which quickly causes root rot. Placing the cactus in a low-light environment leads to etiolation, causing the stems to grow thin, weak, and lose their natural aesthetic appeal.
Bibliography
References
Watering
10-30 Days
Water only when the substrate is completely dry during spring and summer; keep dry during winter.
Soil
Well-draining, porous cactus potting mix with pumice and fine gravel
Requires highly porous, sandy, and gritty cactus soil mixes with excellent drainage properties.
Safety
Pet Friendly
Equipped with sharp spines; keep out of reach of children and curious domestic pets.
Difficulty
Moderate
Moderately easy to care for, provided you do not overwater and maintain proper light levels.
Native Habitat
Honduras, Central America
Endemic to the seasonally dry tropical forests of Honduras, where it grows on rocky substrates and dry plains.
Frequently Asked Questions
How often should Acanthocereus lempirensis be watered?
Water about every 10 days in summer, ensuring the soil is completely dry. In winter, reduce watering to once every 30 days.
Is it toxic to pets?
While not chemically toxic, its sharp physical spines pose a physical injury hazard to pets and children.
What kind of soil does it prefer?
It prefers a highly porous cactus mix rich in pumice, grit, and coarse sand for rapid drainage.
How many hours of light does it need?
It requires at least 5-6 hours of bright, indirect light daily for healthy growth.
Will it bloom indoors?
If provided with sufficient sunlight and a cool winter dormancy, it can produce large white flowers on summer nights.
What is its growth rate?
It is a moderately fast-growing shrubby cactus compared to globular species, showing noticeable growth each year with proper care.
What temperature can it tolerate in winter?
It can tolerate temperatures down to 8°C (46°F). It must be absolutely protected from frost.
When should it be repotted?
Repot every 2-3 years in early spring, moving to a slightly larger pot only when the roots have filled the current container.
Why is my cactus turning yellow and soft?
This is typically a sign of root rot due to overwatering. Stop watering immediately and cut away any decayed parts.
Can it be grown outdoors?
Yes, it thrives outdoors on sunny balconies during summer, but must be brought indoors during freezing winter months.