Light
Bright Indirect Light
Requires 4-6 hours of bright, filtered sunlight; protect from harsh afternoon sun.
Reference image 
Reference image Coryphantha maiz-tablasensis
Maiz-Tablas Pincushion
Overview
Coryphantha maiz-tablasensis is a slow-growing, highly sought-after cactus species belonging to the family Cactaceae. Due to its limited distribution and habitat loss, it is considered vulnerable in the wild 1.
Taxonomy and Naming
The species name refers to its discovery sites in San Luis Potosí, Mexico: 'Maiz' and 'Las Tablas' 2. Within the genus Coryphantha, it is characterized by its flattened, globose shape and distinct tubercular structure.
Distribution and Habitat
Endemic to Mexico, specifically the state of San Luis Potosí, this succulent subshrub inhabits dry shrublands and limestone plains 1. It typically grows under the protective canopy of desert grasses and small shrubs at elevations of 1,000 to 1,500 meters.
Appearance
The stem is solitary, globose to somewhat depressed, and dull blue-green in color. The tubercles are broad, low, and somewhat flattened on top. Spines are few, relatively short, and appressed against the body. In summer, large, pale yellow to cream-colored flowers emerge from the plant's apex 2.
Cultivation
It requires a highly porous, mineral-rich substrate with excellent drainage. Watering should be done thoroughly during the active spring and summer growth phases, only when the soil is completely dry. In winter, the plant must be kept dry and cool to encourage dormancy.
Common Cultivation Mistakes
Overwatering and poorly draining soil are the primary causes of root rot and plant loss 2. Insufficient light leads to etiolation, causing the naturally globose stem to stretch and weaken.
Bibliography
References
Watering
10-30 Days
Allow soil to dry out completely between waterings; suspend watering entirely in winter.
Soil
Gritty, mineral-rich, porous and well-draining cactus mix with high pumice content
Use a mineral-heavy mix with plenty of pumice, grit, and limestone chips.
Safety
Pet Friendly
Non-toxic to pets, but has sharp spines that can cause minor physical injury.
Difficulty
Moderate
Moderate; susceptible to overwatering, but straightforward under correct watering regimes.
Native Habitat
Mexico (San Luis Potosí)
Naturally occurring in the semi-arid desert regions of San Luis Potosí, Mexico, growing in limestone-rich soils under the shade of low shrubs.
Frequently Asked Questions
Can Maiz-Tablas Pincushion be grown indoors?
Yes, it can be grown indoors, provided it is placed on a bright south- or west-facing windowsill that receives ample light.
How often should it be watered?
Water roughly every 10 days in summer only after the soil has dried out completely. Suspend watering entirely during winter.
What type of soil should be used?
A highly porous mineral soil mix low in organic matter, rich in pumice, lava rock, and coarse sand, is ideal.
When does this cactus bloom?
It produces large yellow flowers at the crown in summer, provided it gets enough sun and experiences a cool winter dormancy.
Is it toxic to pets?
No, it is non-toxic, but the spines can cause physical injury to inquisitive cats and dogs.
What is its growth rate?
It is a very slow-growing cactus that may take many years to reach its mature size.
What temperature does it need in winter?
During winter dormancy, it does best in dry, well-ventilated areas kept between 5°C and 10°C.
How often should it be repotted?
Due to its slow growth, repotting is only necessary every 2-3 years in early spring into a slightly larger pot.
Is wrinkling of the stem normal?
Slight wrinkling in winter due to dry conditions is normal. In summer, wrinkling indicates the plant is dehydrated.
How can I prevent my cactus from rotting?
Avoid leaving standing water in the saucer, do not water in humid weather, and ensure the pot has excellent drainage holes.