Light
Full Sun
Strong light supports compact growth. Do not move a low-light plant abruptly into harsh sun.
Reference imageMammillaria pectinifera
Comb Mammillaria
What kind of cactus is Mammillaria pectinifera?
Mammillaria pectinifera is a small, depressed-globose cactus endemic to the Tehuacán–Cuicatlán region of Puebla and Oaxaca.12 Short white radial spines form a flattened comb-like ring around each areole; the epithet “pectinifera” reflects this arrangement. Its low stem and dense spine cover can make plants difficult to see in rocky limestone habitat.
Native range and conservation
The verified native range is restricted to Puebla and Oaxaca.1 Small populations face habitat fragmentation, land-use change, and collection pressure. Genetic research found recent bottlenecks and heterozygote deficiency in some populations and recommends habitat connectivity, seed banking, and artificial propagation as long-term conservation tools.3
The global IUCN category is EN, the Mexican national category is Amenazada, and international trade is controlled by CITES Appendix I. These systems operate at different scales, but together they make one practical rule clear: never source plants removed from wild populations.
Light and temperature management
Strong light supports compact growth. The plant can receive sun in a greenhouse or outdoors, but a specimen raised under lower light should not be moved abruptly into harsh midday sun. Acclimation over several weeks reduces scorch risk. No universal minimum temperature is promised; wet, cold roots in a pot are generally more dangerous than dry cool conditions.
Watering and growing medium
Water according to complete drying of the mix, not a fixed calendar. During active growth, soak the root ball and then let every excess drain away. Drying slows during cool or low-light periods, so watering naturally becomes less frequent. A narrow desert range does not mean the roots never receive water; the key is a wet-dry cycle with oxygen returning rapidly to the root zone.
Use a mineral-rich, airy, fast-draining mix that may include coarse limestone-derived particles. Dense organic mixes increase rot risk. An oversized pot can also create a large volume that remains wet long after the small root system has used available moisture.
Safety and ethical provenance
The best-supported household concern is mechanical injury from the spines rather than a claim of chemical toxicity. Restrict access for children and pets. Because the species is in CITES Appendix I, provenance matters: choose documented, artificially propagated material only.
References
- Plants of the World Online. “Mammillaria pectinifera F.A.C.Weber.” Royal Botanic Gardens, Kew. Accessed: 2026-08-04. https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:134947-1 ↩
- Valverde, P. L. et al. “Assessment of extinction risk of Mammillaria pectinifera.” Revista Mexicana de Biodiversidad 80: 219–230. https://www.scielo.org.mx/scielo.php?pid=S1870-34532009000100024&script=sci_arttext ↩
- Maya-García, R. et al. “Landscape genetics reveals inbreeding and genetic bottlenecks in Mammillaria pectinifera.” Plant Diversity 39(1): 13–19. https://doi.org/10.1016/j.pld.2016.09.005 ↩
Watering
Measured
Do not use a calendar. Water after complete drying and reduce frequency during cool or low-light periods.
Soil
Mineral-rich, airy, fast-draining cactus mix
Use a mineral-rich, coarse, airy, fast-draining mix in a modest drainage-holed pot.
Safety
Contact/Ingestion Risk
Spines present a mechanical injury risk. The species is in CITES Appendix I; choose documented artificially propagated material only.
Difficulty
Easy
Slow growth and sensitivity to excess moisture require care; it is manageable with strong light and strict drainage.
Native Habitat
Puebla and Oaxaca, Mexico
The species is endemic to Puebla and Oaxaca in the Tehuacán–Cuicatlán region. Other Mexican states in the old live text are not verified native range.[^1] [^1]: Plants of the World Online. “Mammillaria pectinifera F.A.C.Weber.” Accessed: 2026-08-04. https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:134947-1
Frequently Asked Questions
Where is Mammillaria pectinifera native?
It is native only to Puebla and Oaxaca in Mexico, especially the Tehuacán–Cuicatlán region.
What is its conservation status?
The IUCN 2022.2 record is EN, Mexico lists it as Amenazada, and the species is included in CITES Appendix I.
How often should it be watered?
There is no fixed interval. Water deeply after the mix has dried throughout and remove all excess water.
Can it take direct sun?
It prefers strong light, but a plant raised under lower light should be acclimated to direct sun over several weeks.
What growing medium is suitable?
Use a mineral-rich, airy, fast-draining mix that does not remain wet for long periods.
Why does it look comb-like?
Short white radial spines lie flat around each areole in an arrangement resembling the teeth of a comb.
Is it safe around pets?
Strong evidence of chemical toxicity is lacking, but the dense spines present a mechanical risk to eyes, mouth, and skin.
Can a wild-collected plant be purchased?
No. Because of CITES Appendix I and serious conservation pressure, choose documented artificially propagated material only.
