Light
Bright Indirect Light
Requires abundant bright, indirect light or filtered sunlight; shield from intense afternoon sun to prevent sunburn.
Reference image Matucana paucicostata
Few-ribbed Matucana
Overview
Matucana paucicostata is a rare and highly sought-after globular to short-cylindrical cactus species native to the high-altitude valleys of Peru. Belonging to the family Cactaceae, it is particularly celebrated among succulent enthusiasts for its distinct ribbing, dark bluish-green epidermis, and striking, tubular crimson-purple flowers.
Taxonomy and Naming
The species was formally described in 1963 by the renowned German botanist Friedrich Ritter 1. The genus name Matucana honors the town of Matucana in Peru, where the first specimens of the genus were found. The specific epithet paucicostata derives from Latin, meaning 'few-ribbed', highlighting its characteristic low number of wavy, tuberculate ribs 2.
Distribution and Habitat
This cactus is endemic to western South America, specifically in the Ancash region of Peru along the Marañón River basin, growing at elevations between 1800 and 2200 meters above sea level 3. It thrives on steep, rocky cliffs, gravelly slopes, and dry shrublands. Due to its limited geographic range and habitat degradation, it is classified as Vulnerable (VU) on the IUCN Red List.
Appearance
The stem is solitary or slowly offsetting from the base, growing up to 15 cm tall and 7-10 cm in diameter. It possesses about 7 to 11 broad, prominent ribs. The areoles bear slightly curved, reddish-brown spines that fade to a weathered grey color. In summer, it produces spectacular zygomorphic, funnel-shaped flowers that are carmine-red and about 6 cm long.
Cultivation
Matucana paucicostata requires an extremely porous, mineral-rich substrate to prevent root rot. It thrives under bright, indirect light or filtered morning sun. Watering should be thorough but infrequent, allowing the potting mix to dry out completely. During winter dormancy, it must be kept dry and cool, tolerating temperatures down to 5°C.
Common Cultivation Errors
The most common issue is overwatering during winter, which quickly causes root loss and body rot. Insufficient light leads to etiolation, causing the stem to stretch abnormally and lose its attractive blue-green color.
References
Watering
10-30 Days
Allow the potting medium to dry out 100% between waterings. Suspend watering almost completely in winter.
Soil
Well-draining, pumice and lava grit heavy mineral cactus mix
Requires an extremely fast-draining, mineral-based soil mix with high pumice, gravel, and low organic content.
Safety
Pet Friendly
Non-toxic to pets and humans, but features sharp spines that require careful handling and safe placement.
Difficulty
Moderate
Moderate. Easy to care for if substrate drainage is excellent and watering is restricted during cold periods.
Native Habitat
Peru (Western South America)
Found growing on the steep rocky ledges and dry valley cliffs of the Marañón River drainage system in the Ancash region of Peru, adapting to dry alpine-desert conditions.
Frequently Asked Questions
How often should Matucana paucicostata be watered?
During summer, water only when the soil is completely dry (roughly every 10 days). In winter dormancy, reduce watering to once a month or keep completely dry.
Is it toxic to pets?
No, *Matucana paucicostata* is non-toxic. However, keep it out of reach as its sharp spines can cause physical injury to curious pets.
What kind of potting soil should be used?
Standard potting soil holds too much moisture. Use a highly mineralized cactus mix containing pumice, perlite, lava rock, and grit with minimal organic matter.
Is it cold hardy in winter?
It can tolerate temperatures down to 5°C for brief periods, provided the soil is bone dry. It must be protected from frost and kept in a cool indoor spot during winter.
How can I encourage it to bloom?
For vibrant summer blooms, provide a cool (around 10-12°C) and completely dry winter dormancy, followed by plenty of filtered sunlight from spring onward.
Should it receive direct sunlight?
It loves bright, filtered direct sunlight like morning sun. However, intense, direct midday summer sun can cause permanent sunburn scars on the epidermis.
What is its growth rate?
It is a slow to moderate grower. Under correct drainage and bright light conditions, it grows a few centimeters per year and may eventually produce offsets from the base.
When should it be repotted?
Due to its slow growth, repotting is only necessary every 2-3 years in early spring, shifting to a slightly larger pot with drainage holes when roots crowd the pot.
Why is the stem shriveling?
Shriveling is usually caused by extreme dehydration, or conversely, root rot from overwatering, which prevents the plant from absorbing water. Check the root health.
Can it be grown indoors?
Yes, it can be grown successfully indoors in front of a very bright south- or west-facing window. Insufficient light will cause the plant to etiolate and lose its shape.