Light
Full Sun
Full sun; requires intense, direct sunlight throughout the day.
Reference image Maihueniopsis hickenii
Patagonian Cushion Cactus
Overview
Maihueniopsis hickenii is a cushion-forming, low-growing succulent shrub belonging to the Cactaceae family, highly adapted to the harsh conditions of Patagonia 1. It is known for its remarkable cold tolerance and compact growth habit.
Classification and naming
The species belongs to the genus Maihueniopsis. The specific epithet \"hickenii\" honors the prominent Argentine botanist Cristóbal María Hicken. It has historically been classified under Opuntia due to its segmented growth, but phylogenetic studies place it firmly within Maihueniopsis 2.
Distribution and habitat
This species is native to southern Argentina, particularly in the Patagonian provinces of Santa Cruz, Chubut, and Río Negro 1. It thrives in arid, wind-swept gravelly plains and rocky slopes at moderate to high elevations, enduring extreme temperature fluctuations.
Appearance
It forms dense, flat cushions composed of small, egg-shaped to cylindrical segments. The segments are dull greyish-green, bearing prominent areoles with sturdy, yellowish-brown, flattened spines. In late spring or summer, it produces beautiful, bright yellow cup-shaped flowers at the branch tips.
Cultivation and care
In cultivation, Maihueniopsis hickenii requires full sun and exceptionally well-drained, mineral-rich soil 2. Given its Patagonian origin, it is extremely cold-hardy, tolerating temperatures down to -15°C, provided the substrate is kept entirely dry during the winter resting period. Watering should be deep but infrequent in summer.
Common cultivation mistakes
The most common pitfall is overwatering, especially during winter. A combination of cold temperatures and wet soil quickly leads to root and stem rot. Insufficient sunlight will cause weak, elongated growth.
References
Watering
14-45 Days
Water only when soil is completely dry in summer; keep bone-dry in winter.
Soil
Highly drained, gritty soil mix with coarse sand, pumice, and minimal humus
Extremely gritty, stony soil mix rich in pumice and coarse sand.
Safety
Contact/Ingestion Risk
Armed with sharp, sturdy spines. Handle with thick protective gloves.
Difficulty
Moderate
Extremely cold-hardy but highly vulnerable to excess moisture and winter wetness.
Native Habitat
Argentina
Native to the windswept, cold, and arid gravelly plains and rocky slopes of southern Argentina\'s Patagonian region.
Frequently Asked Questions
Can this cactus be grown indoors?
Yes, but it requires very high light and excellent air circulation. South-facing windows with direct sunlight are preferred.
How cold-hardy is it in winter?
If kept completely dry, it is extremely cold-hardy, tolerating freezing temperatures down to -15°C.
How often should I water it in summer?
Water deeply only after the soil has completely dried out, typically every 10-14 days during summer.
Is it toxic to pets?
It is non-toxic, but the strong, sharp spines pose a physical injury risk to curious pets.
What type of pot and soil should be used?
Clay or terracotta pots with drainage holes and a mineral-rich soil mix loaded with pumice should be used.
When and what color does it bloom?
It produces large, bright yellow flowers from the tips of mature segments in late spring to early summer.
What is its growth rate?
It is a very slow-growing species, gradually spreading over many years to form compact cushions.
Should it be watered in winter?
Watering should be almost completely suspended during its winter dormancy. Wet winter soil will rot the plant.
What should I do if pricked by its spines?
The spines are sturdy and should be carefully removed with tweezers. Wear thick gloves when handling to avoid injury.
What are its fertilizer requirements?
Apply a half-strength diluted cactus fertilizer once a month during spring and summer.