Light
Bright Indirect Light
Thrives in bright, indirect sunlight or filtered sun. Protect from scorching afternoon sun.
Reference image 
Reference image Coryphantha georgii
George's Beehive Cactus
Overview
Coryphantha georgii is a distinctive succulent subshrub cactus belonging to the family Cactaceae. Well-known among succulent enthusiasts, this species is highly valued for its geometric tubercle arrangement and robust spine clusters, displaying perfect adaptations to arid desert environments 1.
Classification and Naming
Classified under the genus Coryphantha, this species exhibits the classic 'beehive' look. It is distinguished from Mammillaria by the characteristic longitudinal grooves present on the upper surface of its mature tubercles, a key taxonomic feature of the genus 2.
Origin and Habitat
Native to northern and central Mexico, its distribution spans across Aguascalientes, San Luis Potosí, Querétaro, Zacatecas, Durango, and Hidalgo. It typically thrives in semi-arid matorral habitats, gravelly limestone slopes, and rocky crevices where it receives partial shade from nurse plants 1.
Appearance
The stem is mostly solitary, globose to short-cylindrical, with a woolly apex. It features prominent, spirally arranged tubercles. Radial spines are needle-like, radiating outwards, while the central spines are stouter and darker. The funnel-shaped flowers appear in summer near the stem tip, boasting pale yellow, cream, or light pinkish hues.
Cultivation
In cultivation, Coryphantha georgii requires an exceptionally gritty, mineral-based substrate with minimal organic matter. It demands strong indirect sunlight and strict dry periods during winter, during which it can tolerate brief sub-zero temperatures if kept dry 2.
Common Cultivation Mistakes
Overwatering and the use of dense, peat-heavy soils are the leading causes of root rot. Inadequate ventilation combined with cold, damp air in winter can quickly lead to fungal attacks and tissue collapse.
References
Watering
10-30 Days
Allow soil to dry out 100% between waterings. Suspend watering entirely during winter.
Soil
Highly-drained cactus grit mix with pumice and coarse sand
Extremely porous mineral substrate composed of pumice, grit, and coarse sand.
Safety
Risky for Pets
Features sharp, rigid spines. Handle with thick gloves and keep away from pets.
Difficulty
Moderate
Moderately easy for experienced growers who can strictly regulate watering and soil moisture.
Native Habitat
Mexico (Central and Northern regions)
Naturally distributed across the high-altitude semi-deserts and rocky limestone slopes of states like San Luis Potosí, Durango, and Zacatecas in Mexico.
Frequently Asked Questions
How often should Coryphantha georgii be watered?
In summer, water approximately every 10 days only after the soil has dried out completely. Suspend watering entirely during winter dormancy.
What type of soil mix should be used?
Use a mineral-rich, highly draining substrate containing pumice, volcanic rock, coarse sand, and a very small fraction of organic potting soil.
Can it tolerate direct sunlight?
It prefers bright, filtered sun. Direct, scorching midday summer sun can cause sunburn scars on the epidermis.
What is its cold hardiness in winter?
It can tolerate brief drops down to -5°C (23°F) only if the soil is kept bone-dry. Ideally, keep it above 5-10°C.
Is it toxic to pets?
Its sharp, rigid spines pose a physical danger to pets. Additionally, the sap may cause mild gastrointestinal irritation if ingested.
When does Coryphantha georgii bloom?
It typically blooms during the summer months, producing cream or pale yellow funnel-shaped flowers from the woolly apex.
Is it suitable for indoor pot cultivation?
Yes, it is suitable for indoor growing provided it is placed on a south-facing windowsill or a bright balcony with adequate airflow.
What is its growth rate?
It is a slow-growing cactus species. It requires patience and takes several years to mature and fully develop its characteristic shape.
Why is my cactus becoming soft?
Softening usually indicates root rot caused by overwatering or poor drainage. Stop watering immediately and check the root system.
How often should it be repotted?
Repot every 2 to 3 years in early spring, or when the root system fully occupies the current container, moving to a slightly larger pot.